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Earnings Per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Numerator |  |  |  |
Net income (controlling interest) | $ 128.4 | $ 71.3 | $ 387.3 | $ 86.3
Interest expense on junior convertible securities, net of taxes | 4.6 | 0.0 | 13.9 | 0.0
Net income (controlling interest), as adjusted | $ 133.0 | $ 71.3 | $ 401.2 | $ 86.3
Denominator |  |  |  |
Average shares outstanding (basic) (in shares) | 41.1 | 46.3 | 41.8 | 47.1
Effect of dilutive instruments: |  |  |  |
Stock options and restricted stock units (in shares) | 1.1 | 0.2 | 0.9 | 0.1
Junior convertible securities (in shares) | 2.1 | 0.0 | 2.1 | 0.0
Average shares outstanding (diluted) (in shares) | 44.3 | 46.5 | 44.8 | 47.2

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