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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($) shares in Millions, $ in Millions		1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Sep. 30, 2022	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE				$ 1,094.8	$ 1,077.4
Net income (loss)			$ (4,463.8)	(23.6)	181.8	$ (4,857.6)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests			4.8	4.3	17.4	7.2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits			(0.1)	9.1	(23.8)	76.3
Net other comprehensive income (loss)			(5.5)	(9.1)	23.8	$ (94.1)
BALANCE	$ 1,094.8		$ 1,094.8	$ 1,077.4	1,297.9
Stock Issued During Period, Shares, New Issues	75.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation					$ (2.5)
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation		100.0			0.0
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE, shares			206.1	75.0	75.0	205.9
BALANCE			$ 82.6	$ 0.8	$ 0.8	$ 82.5
Stock Issued During Period, Value, New Issues			$ 0.8
Shares Issued Under Share Based Compensation Plans, Shares					0.2	0.2
BALANCE, shares	75.0		75.0	75.0	75.2	206.1
BALANCE	$ 0.8		$ 0.8	$ 0.8	$ 0.8	$ 82.6
Shares Issued Under Share Based Compensation Plans, Amount						(0.1)
Cancellation Of Predecessor Equity, Shares			(206.1)
Cancellation Of Predecessor Equity, Value			$ (82.6)
Stock Issued During Period, Shares, New Issues			75.0
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			$ 8,639.9	1,078.7	1,083.0	8,627.8
Stock Issued During Period, Value, New Issues			1,078.7
Share-based compensation cost						21.2
BALANCE	1,078.7		1,078.7	1,083.0	1,097.9	8,639.9
Shares Issued Under Share Based Compensation Plans, Amount			(0.7)			(1.9)
Cancellation Of Predecessor Equity, Value			(8,644.0)
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			(4,183.8)	0.0	(16.4)	671.7
Net income (loss)			(4,467.0)	(27.4)	176.5	(4,855.5)
BALANCE	0.0		0.0	(16.4)	160.1	(4,183.8)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				11.0
Cancellation Of Predecessor Equity, Value			8,650.8
AOCI [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			(87.9)	0.0	(9.1)	6.2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits			0.1			(76.5)
Net other comprehensive income (loss)			(5.6)	(9.1)	23.8	(17.6)
BALANCE	0.0		0.0	(9.1)	14.7	(87.9)
Cancellation Of Predecessor Equity, Value			93.4
Treasury Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			(76.2)	0.0	0.0	(77.3)
Repurchase of shares						(0.9)
BALANCE	0.0		0.0	0.0	0.0	(76.2)
Shares Issued Under Share Based Compensation Plans, Amount			(0.7)			(2.0)
Cancellation Of Predecessor Equity, Value			75.5
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			(4.3)	(1.1)	2.7	(1.3)
Net income (loss)			3.2	3.8	5.3	(2.1)
Distributions to noncontrolling interests						(0.9)
BALANCE	(1.1)		(1.1)	2.7	8.0	(4.3)
Warrant
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			0.0	16.4	16.4	0.0
Stock Issued During Period, Value, New Issues			16.4
BALANCE	$ 16.4		$ 16.4	$ 16.4	$ 16.4	$ 0.0

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