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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator        
Net income (controlling interest) $ 100.1 $ 64.7 $ 177.2 $ 127.1
Convertible securities interest expense, net 3.8 0 0 0
Net income (controlling interest), as adjusted $ 103.9 $ 64.7 $ 177.2 $ 127.1
Denominator        
Average shares outstanding—basic (in shares) 55.4 53.1 54.6 52.9
Effect of dilutive instruments:        
Contingently convertible securities (in shares) 2.1 0 0 0
Stock options and restricted stock (in shares) 1.2 1.2 1.2 1.2
Forward equity (in shares) 0 0.3 0.1 0.3
Average shares outstanding—diluted (in shares) 58.7 54.6 55.9 54.4