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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	Apr. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance			$ 1,094.8		$ 4,370.3				$ 4,370.3	$ 1,094.8
Net loss				$ (52.8)		$ (672.0)			(4,463.8)	(56.9)	$ (4,788.5)
Purchase of noncontrolling interests						(7.2)
Net other comprehensive income (loss)				0.0		$ 2.1			(5.5)	(0.2)	$ (17.4)
Shares issued upon emergence (in shares)	75.0
Ending balance	$ 1,094.8	$ 1,094.8		$ 1,039.3					$ 1,094.8	$ 1,039.3
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance (in shares)		206.1	75.0	75.0	206.1	206.1	205.9	205.9	206.1	75.0	205.9
Beginning balance		$ 82.6	$ 0.8	$ 0.8	$ 82.6	$ 82.6	$ 82.5	$ 82.5	$ 82.6	$ 0.8	$ 82.5
Shares issued under share-based compensation plans, net		0.0					$ (0.1)
Cancellation of Predecessor equity		(82.6)
Cancellation of predecessor equity (in shares)		$ (206.1)
Shares issued upon emergence (in shares)		75.0
Issuance of Successor Common Shares and Warrants		$ 0.8
Shares issued under share-based compensation plans, net		0.0					0.2
Ending balance (in shares)	75.0	75.0	75.0	75.0	206.1	206.1	206.1	205.9	75.0	75.0	206.1
Ending balance	$ 0.8	$ 0.8	$ 0.8	$ 0.8	$ 82.6	$ 82.6	$ 82.6	$ 82.5	$ 0.8	$ 0.8	$ 82.6
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		8,643.5	1,078.7	1,078.7	8,639.9	8,639.9	8,634.9	8,627.8	8,639.9	1,078.7	8,627.8
Shares issued under share-based compensation plans, net		(0.5)			(0.2)	(0.5)	(0.7)	(0.7)
Share-based compensation cost		1.0		1.6	3.8	4.3	5.7	7.8
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	1,078.7	1,080.3	8,643.5	8,636.5	8,639.9	8,634.9	1,078.7	1,080.3	8,636.5
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		(5,093.8)	0.0	(6.2)	(4,183.8)	(3,442.0)	(2,334.6)	671.7	(4,183.8)	0.0	671.7
Net loss		(3,557.0)	(6.2)	(54.5)	(910.0)	(670.9)	(1,107.4)	(3,006.3)
Cancellation of Predecessor equity		8,650.8
Ending balance	0.0	0.0	(6.2)	(60.7)	(5,093.8)	(4,112.9)	(3,442.0)	(2,334.6)	0.0	(60.7)	(4,112.9)
AOCI Attributable to Parent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		(93.2)	0.0	(0.2)	(87.9)	(13.3)	(7.2)	6.2	(87.9)	0.0	6.2
Net changes in pension and other postretirement benefits					0.1
Net other comprehensive income (loss)		(0.2)	(0.2)		(5.4)	2.1	(6.1)	(13.4)
Cancellation of Predecessor equity		93.4
Ending balance	0.0	0.0	(0.2)	(0.2)	(93.2)	(11.2)	(13.3)	(7.2)	0.0	(0.2)	(11.2)
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		(76.0)	0.0	0.0	(76.2)	(76.8)	(77.3)	(77.3)	(76.2)	0.0	(77.3)
Shares issued under share-based compensation plans, net		(0.5)			(0.2)	(0.5)	(0.6)	(0.9)
Repurchase of shares							(0.1)	(0.9)
Cancellation of Predecessor equity		75.5
Ending balance	0.0	0.0	0.0	0.0	(76.0)	(76.3)	(76.8)	(77.3)	0.0	0.0	(76.3)
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		(1.9)	(1.1)	1.0	(4.3)	(5.0)	(2.7)	(1.3)	(4.3)	(1.1)	(1.3)
Net loss		0.8	2.1	1.7	2.4	(1.1)	(1.4)	(1.4)
Distributions to noncontrolling interests						0.0	(0.9)
Ending balance	(1.1)	(1.1)	1.0	2.7	(1.9)	$ (6.1)	$ (5.0)	$ (2.7)	(1.1)	2.7	$ (6.1)
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance		0.0	16.4	16.4	0.0				0.0	16.4
Issuance of Successor Common Shares and Warrants		16.4
Ending balance	$ 16.4	$ 16.4	$ 16.4	$ 16.4	$ 0.0				$ 16.4	$ 16.4

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