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Stock-Based Compensation - Options (Details) (Stock Options [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock Options [Member]
        
Number of shares        
Beginning Balance (in shares)     2.8  
Granted (in shares)     0.2  
Forfeited (in shares)     0  
Exercised (in shares)     (0.1)  
Ending balance (in shares) 2.9   2.9  
Options exercisable (in shares) 2.3   2.3  
Weighted average grant date fair value        
Beginning balance (dollars per share)     $ 21.73  
Granted (dollars per share)     $ 51.91  
Forfeited (dollars per share)     $ 50.55  
Exercised (dollars per share)     $ 19.56  
Ending balance (dollars per share) $ 24.11   $ 24.11  
Options exercisable (dollars per share) $ 19.17   $ 19.17  
Ending balance weighted average remaining contractual term (in years)     5 years 10 months 27 days  
Options exercisable weighted average remaining contractual term (in years)     5 years 2 months 1 day  
Ending balance aggregate intrinsic value $ 91.9   $ 91.9  
Options exercisable aggregate intrinsic value 94.7   94.7  
Total intrinsic value of options exercised $ 3.0 $ 4.4 $ 5.7 $ 12.4