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Other Commitments and Contingencies (Expense Incurred and Insurance Recoveries) (Details) - USD ($)
$ in Millions
 4 Months Ended 12 Months Ended 16 Months Ended 28 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Expense and Insurance Recoveries [Line Items]        
Third-Party Claims, fines, penalties, and settlements   $ (5.0) $ 1,041.0 $ 1,036.0
Other incident-related costs   22.0 420.0 442.0
Total $ 1,023.0 17.0 1,461.0 1,478.0
Insurance Recoveries   0.0 (800.0) (800.0)
Impact to income (loss) before income taxes   $ 17.0 $ 661.0 $ 678.0