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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
Mar. 31, 2018
Mar. 31, 2017
Numerator    
Net income (controlling interest) $ 153.0 $ 122.5
Interest expense on convertible securities, net of taxes 4.7 3.8
Net income (controlling interest), as adjusted $ 157.7 $ 126.3
Denominator    
Average shares outstanding—basic (in shares) 54.6 56.7
Effect of dilutive instruments:    
Stock options and restricted stock (in shares) 0.2 0.3
Convertible securities (in shares) 2.2 2.2
Average shares outstanding—diluted (in shares) 57.0 59.2