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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. 23, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Feb. 26, 2013
Restricted stock, 2013 grant
May 15, 2013
Non-employee director restricted stock award
Directors Equity Plan May 2011
Equity              
Issuance of common stock in connection with the exercise of employee stock options (in shares)       878,167      
Total proceeds from the exercise of employee stock options       $ 42.4 $ 9.7    
Common stock quarterly dividend per share, after increase (in dollars per share) $ 0.33            
Percentage increase in common stock dividends declared (as a percent) 10.00%            
Common stock dividends quarterly declared and paid per share (in dollars per share)   $ 0.30 $ 0.15 $ 0.60 $ 0.30    
Dividends paid       $ 46.0 $ 22.5    
Share Based Compensation              
Restricted stock granted (in shares)           324,780 12,418
Number of years from grant date that recipient is restricted from trading restricted stock             1 year
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).           134,725  
Fair value of restricted stock granted (in dollars per share)           $ 65.73 $ 67.63
Share of common stock           1  
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    
Common Stock              
Cash dividends per share (in dollars per share) $ 0.33