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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended					4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance					$ 1,060.8					$ 1,060.8
Net income (loss)			$ 77.7			$ (52.8)		$ (4,463.8)	$ (56.9)	150.7
Net reclassification adjustment for amounts recognized in net income as a component of net periodic benefit			0.0	$ (0.1)		(0.2)		0.1	(0.2)	(0.1)
Shares withheld for taxes on vesting of share-based awards			(2.3)	$ (0.2)
Net other comprehensive income (loss)			0.1			$ 0.0		$ (5.5)	$ (0.2)	0.0
Ending balance			$ 1,220.5							$ 1,220.5
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance (in shares)	206.1	75.0	75.0	75.0	75.0	75.0	206.1	206.1	75.0	75.0
Beginning balance	$ 82.6	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 82.6	$ 82.6	$ 0.8	$ 0.8
Cancellation of predecessor equity (in shares)	(206.1)
Cancellation of Predecessor equity	$ (82.6)
Shares issued upon emergence (in shares)	75.0
Issuance of Successor Common Shares and Warrants	$ 0.8
Ending balance (in shares)	75.0	75.0	75.0	75.0	75.0	75.0	206.1	75.0	75.0	75.0
Ending balance	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 82.6	$ 0.8	$ 0.8	$ 0.8
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	8,643.5	1,078.7	1,089.7	1,086.4	1,083.0	1,078.7	8,639.9	8,639.9	1,078.7	1,083.0
Shares issued under share-based compensation plans, net	(0.5)						(0.2)
Share-based compensation cost	1.0		4.6	3.5	3.4	1.6	3.8
Cancellation of Predecessor equity	(8,644.0)
Issuance of Successor Common Shares and Warrants	1,078.7
Ending balance	1,078.7	1,078.7	1,092.0	1,089.7	1,086.4	1,080.3	8,643.5	1,078.7	1,080.3	1,092.0
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	0.0	16.4	16.4	16.4	16.4	16.4	0.0	0.0	16.4	16.4
Issuance of Successor Common Shares and Warrants	16.4
Ending balance	16.4	16.4	16.4	16.4	16.4	16.4	0.0	16.4	16.4	16.4
Retained Earnings (Deficit)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(5,093.8)	0.0	40.0	(71.6)	(33.0)	(6.2)	(4,183.8)	(4,183.8)	0.0	(33.0)
Net income (loss)	(3,557.0)	(6.2)	74.3	111.6	(38.6)	(54.5)	(910.0)
Cancellation of Predecessor equity	8,650.8
Ending balance	0.0	(6.2)	114.3	40.0	(71.6)	(60.7)	(5,093.8)	0.0	(60.7)	114.3
AOCI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(93.2)	0.0	(9.2)	(9.4)	(9.1)	(0.2)	(87.9)	(87.9)	0.0	(9.1)
Net reclassification adjustment for amounts recognized in net loss as a component of net periodic benefit							0.1
Net other comprehensive income (loss)	(0.2)	(0.2)	0.1	0.3	(0.3)		(5.4)
Cancellation of Predecessor equity	93.4
Ending balance	0.0	(0.2)	(9.1)	(9.2)	(9.4)	(0.2)	(93.2)	0.0	(0.2)	(9.1)
Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(76.0)	0.0				0.0	(76.2)	(76.2)	0.0
Shares issued under share-based compensation plans, net	0.5						0.2
Cancellation of Predecessor equity	75.5
Ending balance	0.0	0.0				0.0	(76.0)	0.0	0.0
Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	(1.9)	(1.1)	2.7	1.5	2.7	1.0	(4.3)	(4.3)	(1.1)	2.7
Net income (loss)	0.8	2.1	3.4	1.2	(1.2)	1.7	2.4
Ending balance	$ (1.1)	$ 1.0	$ 6.1	$ 2.7	$ 1.5	$ 2.7	$ (1.9)	$ (1.1)	$ 2.7	$ 6.1

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