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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator |  |  |  |
Net income (controlling interest) | $ 124.9 | $ 125.4 | $ 394.9 | $ 374.2
Interest expense on convertible securities, net of taxes | 4.7 | 3.9 | 14.2 | 11.6
Net income (controlling interest), as adjusted | $ 129.6 | $ 129.3 | $ 409.1 | $ 385.8
Denominator |  |  |  |
Average shares outstanding (basic) (in shares) | 53.1 | 55.8 | 53.9 | 56.3
Effect of dilutive instruments: |  |  |  |
Stock options and restricted stock (in shares) | 0.1 | 0.3 | 0.2 | 0.3
Convertible securities (in shares) | 2.2 | 2.2 | 2.2 | 2.2
Average shares outstanding (diluted) (in shares) | 55.4 | 58.3 | 56.3 | 58.8

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