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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator        
Net income (controlling interest) $ 109.2 $ 107.7 $ 321.1 $ 362.0
Convertible securities interest expense, net 3.9 3.8 11.6 11.5
Net income (controlling interest), as adjusted $ 113.1 $ 111.5 $ 332.7 $ 373.5
Denominator        
Average shares outstanding—basic (in shares) 53.9 54.2 53.9 54.5
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.5 0.6 0.5 0.7
Junior convertible securities (in shares) 2.2 2.2 2.2 2.2
Average shares outstanding—diluted (in shares) 56.6 57.0 56.6 57.4