Quarterly report pursuant to Section 13 or 15(d)

SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Revenues (Details)

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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues $ 1,092.7 $ 743.2 $ 1,451.8 [1] $ 900.2
Realization of deferred revenue 0.0 0.0 34.6 0.0
Steel and Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 715.1 0.0 932.6 0.0
Steel and Manufacturing [Member] | Carbon Steel [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 431.8 0.0 570.4 0.0
Steel and Manufacturing [Member] | Stainless and Electrical Steel [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 222.5 0.0 281.9 0.0
Steel and Manufacturing [Member] | Other Product Lines [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 60.8 0.0 80.3 0.0
Mining and Pelletizing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 377.6 743.2 519.2 900.2
Mining and Pelletizing [Member] | Iron Ore [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 349.7 697.4 481.0 [2] 842.8
Mining and Pelletizing [Member] | Freight [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 27.9 45.8 38.2 57.4
Automotive [Member] | Steel and Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 363.8 0.0 484.0 0.0
Infrastructure and Manufacturing [Member] | Steel and Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 203.4 0.0 247.4 0.0
Distributors and Converters [Member] | Steel and Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 147.9 0.0 201.2 0.0
Steel Producers [Member] | Mining and Pelletizing [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 377.6 743.2 519.2 [3] 900.2
Non-US [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 176.0 $ 136.4 $ 222.7 $ 179.4
[1] Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.
[2] Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.

[3] Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.