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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

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