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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net income (controlling interest) $ 126.3 $ 108.3 $ 248.8 $ 212.3
Interest expense on convertible securities, net of taxes 3.9 3.9 7.8 7.7
Net income (controlling interest), as adjusted $ 130.2 $ 112.2 $ 256.6 $ 220.0
Denominator        
Average shares outstanding—basic (in shares) 56.3 53.8 56.5 53.9
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.2 0.7 0.3 0.6
Junior convertible securities (in shares) 2.2 2.2 2.2 2.2
Average shares outstanding—diluted (in shares) 58.7 56.7 59.0 56.7