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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jul. 22, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 25, 2014
Restricted stock, 2013 grant
Jun. 30, 2014
Restricted stock, 2013 grant
Equity              
Issuance of common stock in connection with the exercise of employee stock options (in shares)       449,141      
Total proceeds from the exercise of employee stock options       $ 21.3 $ 42.4    
Common stock quarterly dividend per share, after increase (in dollars per share) $ 0.35            
Common stock dividend quarterly declared and paid per share (in dollars per share)   $ 0.35 $ 0.30 $ 0.70 $ 0.60    
Dividends paid       $ 54.4 $ 46.0    
Share-Based Compensation              
Restricted stock granted (in shares)           349,380  
Share of common stock           1  
The number of grants made during the period on the basis service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).             136,162
Fair value of the 2014 RSUs granted (in dollars per share)           $ 71.15  
Share Repurchase Program              
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares)   7,883,033   7,883,033      
Number of shares repurchased under stock repurchase program       0 0