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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       $ 6,517.2         $ 6,517.2    
Net income $ 40.5 $ 87.3 $ 592.6 $ 176.7 $ (2,470.3) $ 293.8 $ 262.7 $ 327.9 897.1 $ (1,585.9) $ (3,888.5)
Stock Issued During Period, Shares, New Issues   1,822,432 65,550,000                
Net other comprehensive income (loss)                 6.5 0.6 $ (6.3)
BALANCE $ 8,255.0       $ 6,517.2       $ 8,255.0 $ 6,517.2  
Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE, shares       242,900,000       240,600,000 242,900,000 240,600,000 239,600,000
BALANCE       $ 24.4       $ 24.2 $ 24.4 $ 24.2 $ 24.1
Stock Issued During Period, Shares, New Issues                 65,600,000    
Stock Issued During Period, Value, New Issues                 $ 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                   2,300,000 1,000,000
Shares issued under share-based compensation plans, net                   $ 0.2 $ 0.1
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
Additional Paid-In Capital [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       5,554.5       5,517.5 5,554.5 5,517.5 5,467.2
Stock Issued During Period, Value, New Issues                 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                   0.0 0.4
Tax benefit (deficiency) from share-based compensation                 (3.4) (2.4) 1.2
Share-based compensation cost                 37.3 39.4 48.7
BALANCE 6,402.2       5,554.5       6,402.2 5,554.5 5,517.5
Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       985.3       2,720.4 985.3 2,720.4 7,327.3
Net income                 890.2 (1,594.8) (3,902.6)
Cash dividends paid                 (11.4) (140.3) (704.3)
BALANCE 1,864.1       985.3       1,864.1 985.3 2,720.4
AOCI [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       12.5       11.9 12.5 11.9 18.2
Net other comprehensive income (loss)                 6.5 0.6 (6.3)
BALANCE 19.0       12.5       19.0 12.5 11.9
Treasury Shares [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       (63.8)       (59.0) (63.8) (59.0) (45.2)
Shares issued under share-based compensation plans, net                   (0.2) (0.1)
Repurchase of shares                 (2.0) (4.6) (13.7)
BALANCE (65.8)       (63.8)       (65.8) (63.8) (59.0)
Noncontrolling Interest [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       $ 4.3       $ 7.9 4.3 7.9 7.3
Net income                 6.9 8.9 14.1
Distributions to noncontrolling interests                 (7.8) (12.5) (13.5)
Proceeds from Noncontrolling Interests                 1.0    
BALANCE $ 4.4       $ 4.3       $ 4.4 $ 4.3 $ 7.9