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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net income (controlling interest) $ 124.9 $ 125.4 $ 394.9 $ 374.2
Interest expense on convertible securities, net of taxes 4.7 3.9 14.2 11.6
Net income (controlling interest), as adjusted $ 129.6 $ 129.3 $ 409.1 $ 385.8
Denominator        
Average shares outstanding (basic) (in shares) 53.1 55.8 53.9 56.3
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.1 0.3 0.2 0.3
Convertible securities (in shares) 2.2 2.2 2.2 2.2
Average shares outstanding (diluted) (in shares) 55.4 58.3 56.3 58.8