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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	$ 1,060.8
Net loss	(39.8)	$ (907.6)
Net other comprehensive income (loss)	(0.3)	$ (5.3)
Ending balance	$ 1,024.1
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance (in shares)	75.0	206.1
Beginning balance	$ 0.8	$ 82.6
Ending balance (in shares)	75.0	206.1
Ending balance	$ 0.8	$ 82.6
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	1,083.0	8,639.9
Shares Issued Under Share Based Compensation Plans, Amount		(0.2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	3.4	3.8
Ending balance	1,086.4	8,643.5
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	16.4
Ending balance	16.4
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(33.0)	(4,183.8)
Net loss	(38.6)	(910.0)
Ending balance	(71.6)	(5,093.8)
AOCI Attributable to Parent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(9.1)	(87.9)
Net changes in pension and other postretirement benefits		0.1
Net other comprehensive income (loss)	(0.3)	(5.4)
Ending balance	(9.4)	(93.2)
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		(76.2)
Shares Issued Under Share Based Compensation Plans, Amount		(0.2)
Ending balance		(76.0)
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	2.7	(4.3)
Net loss	(1.2)	2.4
Ending balance	$ 1.5	$ (1.9)

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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