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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($)
shares in Millions, $ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE     $ 1,094.8 $ 1,297.9  
Net income (loss)   $ (4,463.8) (23.6) 866.8 $ 181.8
Share-based compensation cost     (4.3) (27.3) (17.4)
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits   (0.1) 9.1 (10.8) (23.8)
Net other comprehensive income (loss)   (5.5) $ (9.1) 10.5 23.8
Stock Issued During Period, Shares, New Issues 75.0        
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation       (5.4) (2.5)
Treasury Stock, Value, Acquired, Cost Method       200.0  
BALANCE $ 1,094.8 $ 1,094.8   $ 1,997.0 $ 1,297.9
Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE, shares   206.1 75.0 75.2 75.0
BALANCE   $ 82.6 $ 0.8 $ 0.8 $ 0.8
Stock Issued During Period, Value, New Issues   (0.8)      
Shares Issued Under Share Based Compensation Plans, Shares       0.2 0.2
Cancellation Of Predecessor Equity, Shares   (206.1)      
Cancellation Of Predecessor Equity, Value   $ (82.6)      
Stock Issued During Period, Shares, New Issues   (75.0)      
BALANCE, shares 75.0 75.0 75.0 75.4 75.2
BALANCE $ 0.8 $ 0.8 $ 0.8 $ 0.8 $ 0.8
Additional Paid-In Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   8,639.9 1,078.7 1,097.9 1,083.0
Stock Issued During Period, Value, New Issues   (1,078.7)      
Share-based compensation cost   4.8      
Shares Issued Under Share Based Compensation Plans, Amount   (0.7)      
Cancellation Of Predecessor Equity, Value   (8,644.0)      
BALANCE 1,078.7 1,078.7 1,083.0 1,119.8 1,097.9
Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (4,183.8) 0.0 160.1 (16.4)
Net income (loss)   (4,467.0) (27.4) 865.4 176.5
Cancellation Of Predecessor Equity, Value   8,650.8      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount     (11.0)    
BALANCE 0.0 0.0 (16.4) 1,025.5 160.1
AOCI [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (87.9) 0.0 14.7 (9.1)
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits   0.1 (9.1) 10.8 23.8
Net other comprehensive income (loss)   (5.6)   (0.3)  
Cancellation Of Predecessor Equity, Value   93.4      
BALANCE 0.0 0.0 (9.1) 25.2 14.7
Noncontrolling Interest [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (4.3) (1.1) 8.0 2.7
Net income (loss)   3.2 3.8 1.4 5.3
BALANCE (1.1) (1.1) 2.7 9.4 8.0
Warrant          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   0.0 16.4 16.4 16.4
Stock Issued During Period, Value, New Issues   (16.4)      
BALANCE 16.4 16.4 16.4 16.4 16.4
Treasury Stock, Common          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (76.2) 0.0 0.0 0.0
Shares Issued Under Share Based Compensation Plans, Amount   (0.7)      
Cancellation Of Predecessor Equity, Value   75.5      
Treasury Stock, Value, Acquired, Cost Method       (200.1)  
BALANCE $ 0.0 $ 0.0 $ 0.0 $ (200.1) $ 0.0