Quarterly report pursuant to Section 13 or 15(d)

ACQUISITION OF AK STEEL - Pro Forma Information (Details)

v3.20.2
ACQUISITION OF AK STEEL - Pro Forma Information (Details) - AK Steel Holding Corporation [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Pro Forma Revenue $ 1,646.0 $ 1,937.6 $ 4,265.1 $ 5,958.7
Business Acquisition, Pro Forma Net Income (Loss) (6.0) 84.2 $ (123.9) 213.3
Business Acquisition, Pro Forma Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     24.30%  
Business Acquisition, Pro Forma Income Tax Expense (Benefit) (5.6) (2.1) $ (2.1) (4.5)
Fair Value Adjustment to Inventory [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Pro Forma Net Income (Loss) 14.6   74.0 74.0
Acquisition-related Costs [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Pro Forma Net Income (Loss) 0.7   29.1  
Other Adjustments [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Pro Forma Net Income (Loss) (10.0) (1.1) (10.0) (7.0)
Intersegment Eliminations [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Pro Forma Revenue $ 135.6 $ 153.5 $ 394.8 $ 410.8