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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE     $ 9,309.6    
Net loss     (4,857.6) $ (192.2) $ (636.6)
Common Stock, Dividends, Per Share, Cash Paid       $ 0.04 $ 0.16
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     (7.2)    
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits     76.3 $ 21.7 $ 0.0
Net other comprehensive income (loss)     (94.1) (12.0) $ (11.2)
BALANCE     $ 4,370.3 $ 9,309.6  
Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE, shares   111,800 205,900 115,200 111,800
BALANCE   $ 44.8 $ 82.5 $ 46.2 $ 44.8
Shares Issued Under Share Based Compensation Plans, Shares 3,400   200 2,700  
Shares issued under share-based compensation plans, net $ 1.4   $ 0.1 $ 1.1  
BALANCE, shares 115,200   206,100 205,900 115,200
BALANCE $ 46.2   $ 82.6 $ 82.5 $ 46.2
Additional Paid-In Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   7,195.0 8,627.8 7,225.0 7,195.0
Shares issued under share-based compensation plans, net (0.6)   (1.9) (1.3)  
Share-based compensation cost   30.6 21.2 37.2  
Payments of Stock Issuance Costs       (0.6)  
BALANCE 7,225.0   8,639.9 8,627.8 7,225.0
Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   1,532.7 671.7 874.2 1,532.7
Net loss   (639.7) (4,855.5) (198.0)  
Cash dividends paid   (18.0)   (4.5)  
BALANCE 874.2   (4,183.8) 671.7 874.2
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (0.8)     (0.8)
AOCI [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   28.6 6.2 18.2 28.6
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits     (76.5) (21.7)  
Net other comprehensive income (loss)   (11.2) (17.6) 9.7  
BALANCE 18.2   (87.9) 6.2 18.2
AOCI [Member] | Cumulative Effect, Period of Adoption, Adjustment          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   0.8     0.8
Treasury Shares [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (69.0) (77.3) (72.2) (69.0)
Shares issued under share-based compensation plans, net (1.3)   2.0 (0.7)  
Repurchase of shares   (1.9) (0.9) (4.5)  
BALANCE (72.2)   (76.2) (77.3) (72.2)
Noncontrolling Interest [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
BALANCE   (2.1) (1.3) (2.6) (2.1)
Net loss   3.1 (2.1) 5.8  
Distributions to noncontrolling interests   $ (3.6) (0.9) (4.5)  
BALANCE $ (2.6)   $ (4.3) $ (1.3) $ (2.6)
Rowan Companies [Member] | Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Shares, New Issues       88,000  
Stock Issued During Period, Value, New Issues       $ 35.2  
Rowan Companies [Member] | Additional Paid-In Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, New Issues       1,367.5  
Rowan Companies [Member] | Treasury Shares [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, New Issues       $ 0.1