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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($)
$ / shares in Units, 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, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   $ 4,370.3 $ 1,094.8    
Net loss   (4,463.8) (29.2) $ (4,857.6) $ (192.2)
Common Stock, Dividends, Per Share, Cash Paid         $ 40,000.00
Stock Issued During Period, Value, New Issues         $ 0.1
Payments of Stock Issuance Costs         (0.6)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   4.8 4.3 7.2  
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits   (0.1) 9.1 76.3 21.7
Net other comprehensive income (loss)   (5.5) (9.1) (94.1) $ (12.0)
BALANCE $ 1,094.8 $ 1,094.8 $ 1,060.8 $ 4,370.3  
Stock Issued During Period, Shares, New Issues 75.0        
Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE, shares   206.1 75.0 205.9 115.2
BALANCE   $ 82.6 $ 0.8 $ 82.5 $ 46.2
Stock Issued During Period, Value, New Issues   $ 0.8     $ 35.2
Shares Issued Under Share Based Compensation Plans, Shares       0.2 2.7
Shares issued under share-based compensation plans, net         $ 1.1
BALANCE, shares 75.0 75.0 75.0 206.1 205.9
BALANCE $ 0.8 $ 0.8 $ 0.8 $ 82.6 $ 82.5
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     88.0
Additional Paid-In Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   $ 8,639.9 1,078.7 8,627.8 $ 7,225.0
Stock Issued During Period, Value, New Issues   1,078.7     1,367.5
Shares issued under share-based compensation plans, net         (1.3)
Share-based compensation cost       21.2 37.2
BALANCE 1,078.7 1,078.7 1,083.0 8,639.9 8,627.8
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) 0.0 671.7 874.2
Net loss   (4,467.0) (33.0) (4,855.5) (198.0)
Cash dividends paid         (4.5)
BALANCE 0.0 0.0 (33.0) (4,183.8) 671.7
Cancellation Of Predecessor Equity, Value   8,650.8      
AOCI [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (87.9) 0.0 6.2 18.2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits   0.1   (76.5) (21.7)
Net other comprehensive income (loss)   (5.6) (9.1) (17.6) 9.7
BALANCE 0.0 0.0 (9.1) (87.9) 6.2
Cancellation Of Predecessor Equity, Value   93.4      
Treasury Shares [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (76.2) 0.0 (77.3) (72.2)
Shares issued under share-based compensation plans, net         (0.7)
Repurchase of shares       (0.9) (4.5)
BALANCE 0.0 0.0 0.0 (76.2) (77.3)
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) (1.3) (2.6)
Net loss   3.2 3.8 (2.1) 5.8
Distributions to noncontrolling interests       (0.9)  
BALANCE (1.1) (1.1) 2.7 (4.3) (1.3)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders         (4.5)
Warrant          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   0.0 16.4 0.0 0.0
Stock Issued During Period, Value, New Issues   16.4      
BALANCE $ 16.4 $ 16.4 $ 16.4 $ 0.0 $ 0.0