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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Numerator |  |  |  |
Net income (controlling interest) | $ 109.0 | $ 30.7 | $ 258.9 | $ 15.1
Interest expense on junior convertible securities, net of taxes | 4.6 | 0.0 | 9.4 | 0.0
Net income (controlling interest), as adjusted | $ 113.6 | $ 30.7 | $ 268.3 | $ 15.1
Denominator |  |  |  |
Average shares outstanding (basic) (in shares) | 41.6 | 47.2 | 42.1 | 47.5
Effect of dilutive instruments: |  |  |  |
Stock options and restricted stock units (in shares) | 0.9 | 0.1 | 0.8 | 0.1
Junior convertible securities (in shares) | 2.1 | 0.0 | 2.1 | 0.0
Average shares outstanding (diluted) (in shares) | 44.6 | 47.3 | 45.0 | 47.6

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