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Net Income Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Basic net income per common share: |  |  |  |  |  |  |  |
Net income | $ 9.7 | $ (1.0) | $ 42.4 | $ 80.3 | $ 80.9 | $ 72.2 | $ 51.1 | $ 233.4
Weighted average common shares outstanding - Basic (in shares) | 83.8 |  |  | 85.1 |  |  | 83.7 | 85.1
Basic net income per common share | $ 0.12 |  |  | $ 0.94 |  |  | $ 0.61 | $ 2.74
Diluted net income per common share: |  |  |  |  |  |  |  |
Net income | $ 9.7 |  |  | $ 80.3 |  |  | $ 51.1 | $ 233.4
Weighted average common shares outstanding - Basic (in shares) | 83.8 |  |  | 85.1 |  |  | 83.7 | 85.1
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |
Weighted average common shares outstanding - Dilutive (in shares) | 84.0 |  |  | 86.1 |  |  | 84.0 | 86.1
Diluted net income per common share | $ 0.12 |  |  | $ 0.93 |  |  | $ 0.61 | $ 2.71
Restricted Stock Units |  |  |  |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |
Incremental shares from assumed conversions | 0.1 |  |  | 0.4 |  |  | 0.2 | 0.4
Stock Options |  |  |  |  |  |  |  |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |
Incremental shares from assumed conversions | 0.1 |  |  | 0.6 |  |  | 0.1 | 0.6

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