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Supplemental Financial Information Supplemental Financial Information (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Financial Information [Abstract] |  |  |  |
(Gain on) adjustment to bargain purchase |  | $ (6.3) | $ 637.0 | $ 1.8
Proceeds from Legal Settlements | $ 27.5 | 0.0 | 200.0 | 0.0
Gain (Loss) on Extinguishment of Debt |  | 3.1 | 194.1 | (19.0)
Payments for Legal Settlements |  | 0.0 | (20.3) | 0.0
Net foreign currency exchange gains (losses) |  | (11.0) | (7.4) | (17.2)
Other Nonoperating Income |  |  |  | 0.4
Other Nonoperating Expense |  | 3.8 | 4.8 |
Other, net |  | 4.2 | 1,004.4 | (34.8)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component |  | $ 14.6 | $ 5.8 | $ 0.0

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