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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Shares repurchased 0.3      
Average price per share $ 206.81      
Numerator        
Net income (controlling interest) $ 104.3 $ 75.2 $ 281.5 $ 202.3
Convertible securities interest expense, net 3.8 2.6 0 0
Net income (controlling interest), as adjusted $ 108.1 $ 77.8 $ 281.5 $ 202.3
Denominator        
Average shares outstanding—basic (in shares) 55.6 53.2 54.9 53.0
Effect of dilutive instruments:        
Contingently convertible securities (in shares) 2.1 2.0 0 0
Stock options and restricted stock (in shares) 1.1 1.3 1.1 1.4
Forward equity (in shares) 0 0.4 0.1 0.3
Average shares outstanding—diluted (in shares) 58.8 56.9 56.1 54.7