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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Numerator |  |  |  |
Net income (controlling interest) | $ 109.0 | $ 103.2 | $ 365.7 | $ 279.5
Convertible securities interest expense, net | 3.8 | 3.8 | 11.5 | 0.0
Net income (controlling interest), as adjusted | $ 112.8 | $ 107.0 | $ 377.2 | $ 279.5
Denominator |  |  |  |
Average shares outstanding—basic (in shares) | 54.2 | 55.6 | 54.5 | 54.9
Effect of dilutive instruments: |  |  |  |
Stock options and restricted stock (in shares) | 0.6 | 1.1 | 0.7 | 1.1
Forward equity (in shares) | 0.0 | 0.0 | 0.0 | 0.1
Junior convertible securities (in shares) | 2.2 | 2.1 | 2.2 | 0.0
Average shares outstanding—diluted (in shares) | 57.0 | 58.8 | 57.4 | 56.1

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