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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

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