Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details)

v3.20.2
DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 19, 2020
Apr. 24, 2020
Apr. 17, 2020
Mar. 16, 2020
Mar. 13, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 4,640.7            
LONG-TERM DEBT 4,451.6           $ 2,113.8
9.875% 2025 Senior Secured Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross     $ 555.2 $ 400.0      
6.75% 2026 Senior Secured Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross   $ 120.0       $ 725.0  
6.375% 2025 Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross         $ 231.8    
7.00% 2027 Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross         $ 335.4    
Credit Facility              
Debt Instrument [Line Items]              
Long-term Line of Credit $ 550.0            
Cleveland-Cliffs Inc. [Member] | 4.875% 2024 Senior Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 5.00%           5.00%
Long-term Debt, Gross $ 394.5           $ 400.0
Unamortized Debt Issuance Expense (4.0)           (4.6)
Debt Instrument, Unamortized Discount (1.6)           (1.8)
Long-term Debt $ 388.9           $ 393.6
Cleveland-Cliffs Inc. [Member] | 9.875% 2025 Senior Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 10.57%            
Long-term Debt, Gross $ 955.2            
Unamortized Debt Issuance Expense (8.7)            
Debt Instrument, Unamortized Discount (26.7)            
Long-term Debt $ 919.8            
Cleveland-Cliffs Inc. [Member] | 6.75% 2026 Senior Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.99%            
Long-term Debt, Gross $ 845.0            
Unamortized Debt Issuance Expense (22.6)            
Debt Instrument, Unamortized Discount (9.4)            
Long-term Debt $ 813.0            
Cleveland-Cliffs Inc. [Member] | 6.375% 2025 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 8.11%            
Long-term Debt, Gross $ 64.3            
Unamortized Debt Issuance Expense (0.2)            
Debt Instrument, Unamortized Discount (4.8)            
Long-term Debt $ 59.3            
Cleveland-Cliffs Inc. [Member] | 1.50% 2025 Convertible Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.26%           6.26%
Long-term Debt, Gross $ 296.3           $ 316.3
Unamortized Debt Issuance Expense (3.9)           (4.6)
Debt Instrument, Unamortized Discount (55.6)           (65.0)
Long-term Debt $ 236.8           $ 246.7
Cleveland-Cliffs Inc. [Member] | 5.75% 2025 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.01%           6.01%
Long-term Debt, Gross $ 396.2           $ 473.3
Unamortized Debt Issuance Expense (2.8)           (3.6)
Debt Instrument, Unamortized Discount (4.3)           (5.5)
Long-term Debt $ 389.1           $ 464.2
Cleveland-Cliffs Inc. [Member] | 7.00% 2027 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 9.24%            
Long-term Debt, Gross $ 88.0            
Unamortized Debt Issuance Expense (0.3)            
Debt Instrument, Unamortized Discount (9.8)            
Long-term Debt $ 77.9            
Cleveland-Cliffs Inc. [Member] | 5.875% 2027 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.49%           6.49%
Long-term Debt, Gross $ 555.5           $ 750.0
Unamortized Debt Issuance Expense (4.5)           (6.3)
Debt Instrument, Unamortized Discount (19.0)           (27.3)
Long-term Debt $ 532.0           $ 716.4
Cleveland-Cliffs Inc. [Member] | 6.25% 2040 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.34%           6.34%
Long-term Debt, Gross $ 262.7           $ 298.4
Unamortized Debt Issuance Expense (1.9)           (2.2)
Debt Instrument, Unamortized Discount (2.8)           (3.3)
Long-term Debt $ 258.0           292.9
Cleveland-Cliffs Inc. [Member] | Credit Facility              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 2.79%            
Long-term Debt, Gross $ 2,000.0           450.0
Long-term Line of Credit $ 550.0           $ 0.0
AK Steel Holding Corporation [Member] | 7.625% 2021 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 7.33%            
Long-term Debt, Gross $ 33.5            
Unamortized Debt Issuance Expense 0.0            
Debt Instrument, Unamortized Premium 0.1            
Long-term Debt $ 33.6            
AK Steel Holding Corporation [Member] | 7.50% 2023 AK Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 6.17%            
Long-term Debt, Gross $ 12.8            
Unamortized Debt Issuance Expense 0.0            
Debt Instrument, Unamortized Premium 0.5            
Long-term Debt $ 13.3            
AK Steel Holding Corporation [Member] | 6.375% 2025 AK Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 8.11%            
Long-term Debt, Gross $ 38.4            
Unamortized Debt Issuance Expense 0.0            
Debt Instrument, Unamortized Discount (2.9)            
Long-term Debt $ 35.5            
AK Steel Holding Corporation [Member] | 7.00% 2027 AK Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage 9.24%            
Long-term Debt, Gross $ 56.3            
Unamortized Debt Issuance Expense 0.0            
Debt Instrument, Unamortized Discount (6.2)            
Long-term Debt 50.1            
AK Steel Holding Corporation [Member] | Industrial Revenue Bonds [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross 92.0            
Unamortized Debt Issuance Expense 0.0            
Debt Instrument, Unamortized Premium 2.3            
Long-term Debt $ 94.3