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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net income (controlling interest) $ 128.7 $ 99.1 $ 256.7 $ 176.2
Convertible securities interest expense, net 3.8 0.0 7.6 0.0
Net income (controlling interest), as adjusted $ 132.5 $ 99.1 $ 264.3 $ 176.2
Denominator        
Average shares outstanding—basic (in shares) 54.6 55.4 54.7 54.6
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 0.7 1.2 0.8 1.2
Forward equity (in shares) 0.0 0.0 0.0 0.1
Junior convertible securities (in shares) 2.2 0.0 2.2 0.0
Average shares outstanding—diluted (in shares) 57.5 56.6 57.7 55.9