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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       $ 8,222.9         $ 8,222.9    
Net income $ (2,470.3) $ 293.8 $ 262.7 $ 327.9 $ (3,448.5) $ 432.9 $ (1,169.6) $ 296.7 (1,585.9) $ (3,888.5) $ 1,427.9
Net other comprehensive income (loss)                 0.6 (6.3) $ (1.9)
BALANCE $ 6,517.2       $ 8,222.9       $ 6,517.2 $ 8,222.9  
Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE, shares       240.7       239.6 240.7 239.6 237.7
BALANCE       $ 24.2       $ 24.1 $ 24.2 $ 24.1 $ 23.9
Shares issued under share-based compensation plans, net, shares                 2.4 1.1 1.9
Shares issued under share-based compensation plans, net                 $ 0.2 $ 0.1 $ 0.2
BALANCE, shares 243.1       240.7       243.1 240.7 239.6
BALANCE $ 24.4       $ 24.2       $ 24.4 $ 24.2 $ 24.1
Additional Paid-In Capital [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       5,517.5       5,467.2 5,517.5 5,467.2 5,398.7
Shares issued under share-based compensation plans, net                 0.0 0.4 21.8
Tax benefit (deficiency) from share-based compensation                 (2.4) 1.2 0.1
Share-based compensation cost                 39.4 48.7 46.6
BALANCE 5,554.5       5,517.5       5,554.5 5,517.5 5,467.2
Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       2,720.4       7,327.3 2,720.4 7,327.3 6,434.7
Net income                 (1,594.8) (3,902.6) 1,418.2
Cash dividends paid                 (140.3) (704.3) (525.6)
BALANCE 985.3       2,720.4       985.3 2,720.4 7,327.3
AOCI [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       11.9       18.2 11.9 18.2 20.1
Net other comprehensive income (loss)                 0.6 (6.3) (1.9)
BALANCE 12.5       11.9       12.5 11.9 18.2
Treasury Shares [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       (59.0)       (45.2) (59.0) (45.2) (31.0)
Shares issued under share-based compensation plans, net                 (0.2) (0.1) (0.1)
Repurchase of shares                 (4.6) (13.7) (14.1)
BALANCE (63.8)       (59.0)       (63.8) (59.0) (45.2)
Noncontrolling Interest [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
BALANCE       $ 7.9       $ 7.3 7.9 7.3 5.7
Net income                 8.9 14.1 9.7
Distributions to noncontrolling interests                 (12.5) (13.5) (8.1)
BALANCE $ 4.3       $ 7.9       $ 4.3 $ 7.9 $ 7.3