Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Revenues from Product Sales and Services) (Details)

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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Revenues from Product Sales and Services) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenues $ 534.1 $ 555.6 $ 743.2 $ 157.0 $ 696.3 $ 741.8 $ 714.3 $ 180.0 $ 1,989.9 $ 2,332.4 $ 1,866.0
Accounts Receivable, Allowance for Credit Loss $ 0.0       $ 0.0       0.0 0.0 0.0
Product [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,848.1 2,172.3 1,644.6
Freight [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 141.8 160.1 166.7
Venture partners' cost reimbursements [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 $ 0.0 $ 0.0 $ 54.7