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Net Income (Loss) Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Basic net income (loss) per common share: |  |  |  |  |  |
Net income (loss) | $ 2.2 | $ (14.0) | $ (1.0) | $ 42.4 | $ (11.8) | $ 41.4
Weighted average common shares outstanding - Basic (in shares) | 84.1 |  | 83.7 |  | 84.0 | 83.7
Basic net income (loss) per common share | $ 0.03 |  | $ (0.01) |  | $ (0.14) | $ 0.49
Diluted net income (loss) per common share: |  |  |  |  |  |
Net income (loss) | $ 2.2 |  | $ (1.0) |  | $ (11.8) | $ 41.4
Weighted average common shares outstanding - Basic (in shares) | 84.1 |  | 83.7 |  | 84.0 | 83.7
Plus incremental shares from assumed conversions: |  |  |  |  |  |
Weighted average common shares outstanding - Dilutive (in shares) | 84.7 |  | 83.7 |  | 84.0 | 84.1
Diluted net income (loss) per common share | $ 0.03 |  | $ (0.01) |  | $ (0.14) | $ 0.49
Restricted Stock Units |  |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |  |
Incremental shares from assumed conversions | 0.3 |  |  |  |  | 0.2
Stock Options |  |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |  |
Incremental shares from assumed conversions | 0.3 |  |  |  |  | 0.2

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