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Net Income (Loss) Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted |
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
(In millions, except per share data) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 2.2 |  |  | $ | (1.0 | ) |  | $ | (11.8 | ) |  | $ | 41.4 |
Weighted average common shares outstanding |  |  | 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 |  |  | 84.1 |  |  |  | 83.7 |  |  |  | 84.0 |  |  |  | 83.7 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.3 |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Stock options |  |  | 0.3 |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Weighted average common shares outstanding — Dilutive |  |  | 84.7 |  |  |  | 83.7 |  |  |  | 84.0 |  |  |  | 84.1 |
Diluted net income (loss) per common share |  | $ | 0.03 |  |  | $ | (0.01 | ) |  | $ | (0.14 | ) |  | $ | 0.49 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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