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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator        
Net income (controlling interest) $ 107.4 $ 128.7 $ 212.0 $ 256.7
Convertible securities interest expense, net 3.9 3.8 7.7 7.6
Net income (controlling interest), as adjusted $ 111.3 $ 132.5 $ 219.7 $ 264.3
Denominator        
Average shares outstanding—basic (in shares) 53.8 54.6 53.9 54.7
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.5 0.7 0.4 0.8
Junior convertible securities (in shares) 2.2 2.2 2.2 2.2
Average shares outstanding—diluted (in shares) 56.5 57.5 56.5 57.7