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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       $ 8,255.0         $ 8,255.0    
Net income (loss) $ (207.1) $ (28.2) $ (44.3) $ (24.6) $ 40.5 $ 87.3 $ 592.6 $ 176.7 (304.2) $ 897.1 $ (1,585.9)
Stock Issued During Period, Shares, New Issues     65,550,000   1,822,432         1,822,432  
Net other comprehensive income (loss)                 9.6 $ 6.5 $ 0.6
BALANCE $ 8,730.0       $ 8,255.0       $ 8,730.0 $ 8,255.0  
Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE, shares       310,300,000       242,900,000 310,300,000 242,900,000 240,600,000
BALANCE       $ 31.1       $ 24.4 $ 31.1 $ 24.4 $ 24.2
Stock Issued During Period, Shares, New Issues                 132,200,000 65,600,000  
Stock Issued During Period, Value, New Issues                 $ 13.2 $ 6.5  
Conversion of Stock, Shares Issued                   1,800,000  
Conversion of Stock, Amount Issued                   $ 0.2  
Shares issued under share-based compensation plans, net, shares                 4,500,000   2,300,000
Shares issued under share-based compensation plans, net                 $ 0.5   $ 0.2
BALANCE, shares 447,000,000       310,300,000       447,000,000 310,300,000 242,900,000
BALANCE $ 44.8       $ 31.1       $ 44.8 $ 31.1 $ 24.4
Additional Paid-In Capital [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       6,402.2       5,554.5 6,402.2 5,554.5 5,517.5
Stock Issued During Period, Value, New Issues                 757.5 579.0  
Conversion of Stock, Amount Issued                   14.8  
Debt Instrument, Convertible, Carrying Amount of Equity Component         220.0         220.0  
Shares issued under share-based compensation plans, net                 (0.4)   0.0
Tax benefit (deficiency) from share-based compensation                   (3.4) (2.4)
Share-based compensation cost                 35.7 37.3 39.4
BALANCE 7,195.0       6,402.2       7,195.0 6,402.2 5,554.5
Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       1,864.1       985.3 1,864.1 985.3 2,720.4
Net income (loss)                 (303.7) 890.2 (1,594.8)
Cash dividends paid                 (13.6) (11.4) (140.3)
BALANCE 1,532.7       1,864.1       1,532.7 1,864.1 985.3
AOCI [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       19.0       12.5 19.0 12.5 11.9
Net other comprehensive income (loss)                 9.6 6.5 0.6
BALANCE 28.6       19.0       28.6 19.0 12.5
Treasury Shares [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       (65.8)       (63.8) (65.8) (63.8) (59.0)
Shares issued under share-based compensation plans, net                 (1.3)   (0.2)
Repurchase of shares                 (1.9) (2.0) (4.6)
BALANCE (69.0)       (65.8)       (69.0) (65.8) (63.8)
Noncontrolling Interest [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       4.4       $ 4.3 4.4 4.3 7.9
Net income (loss)                 (0.5) 6.9 8.9
Distributions to noncontrolling interests                 (6.0) (7.8) (12.5)
Proceeds from Noncontrolling Interests                   1.0  
BALANCE $ (2.1)       $ 4.4       $ (2.1) $ 4.4 $ 4.3
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-16 [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification       (14.1)              
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-16 [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification       $ (14.1)