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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Numerator |  |
Net income (controlling interest) | $ 122.5 | $ 104.0
Interest expense on convertible securities, net of taxes | 3.8 | 3.8
Net income (controlling interest), as adjusted | $ 126.3 | $ 107.8
Denominator |  |
Average shares outstanding—basic (in shares) | 56.7 | 54.0
Effect of dilutive instruments: |  |
Stock options and restricted stock (in shares) | 0.3 | 0.4
Junior convertible securities (in shares) | 2.2 | 2.2
Average shares outstanding—diluted (in shares) | 59.2 | 56.6

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