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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income (controlling interest) $ 117.0 $ 126.3 $ 270.0 $ 248.8
Interest expense on convertible securities, net of taxes 0.0 3.9 9.5 7.8
Net income (controlling interest), as adjusted $ 117.0 $ 130.2 $ 279.5 $ 256.6
Denominator        
Average shares outstanding (basic) (in shares) 54.0 56.3 54.3 56.5
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.2 0.2 0.3 0.3
Convertible securities (in shares) 0.0 2.2 2.2 2.2
Average shares outstanding (diluted) (in shares) 54.2 58.7 56.8 59.0