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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, 2016
Mar. 31, 2015
Numerator    
Net income (controlling interest) $ 104.5 $ 128.0
Convertible securities interest expense, net 3.8 3.8
Net income (controlling interest), as adjusted $ 108.3 $ 131.8
Denominator    
Average shares outstanding—basic (in shares) 54.0 54.8
Effect of dilutive instruments:    
Stock options and restricted stock (in shares) 0.3 0.8
Junior convertible securities (in shares) 2.2 2.2
Average shares outstanding—diluted (in shares) 56.5 57.8