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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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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of expense related to nonoperating activities, classified as other.

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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Business Combination, Bargain Purchase, Gain Recognized And Adjustment

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