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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Summary of Earnings Per Share Basic and Diluted | Computations of basic and diluted net income per common share for the years ended December 31, 2023, 2022 and 2021, are as follows:
(In millions, except per share data) |  | 2023 |  |  | 2022 |  |  | 2021 |
Basic net income per common share: |  |  |  |  |  |  |  |  |
Net income |  | $ | 105.7 |  |  | $ | 126.3 |  |  | $ | 16.1 |
Weighted average common shares outstanding |  |  | 84.6 |  |  |  | 84.4 |  |  |  | 84.1 |
Basic net income per common share |  | $ | 1.25 |  |  | $ | 1.50 |  |  | $ | 0.19 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — Basic |  |  | 84.6 |  |  |  | 84.4 |  |  |  | 84.1 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 0.5 |  |  |  | 0.4 |  |  |  | 0.3 |
Stock options |  |  | 0.4 |  |  |  | 0.2 |  |  |  | 0.2 |
Weighted average common shares outstanding — Dilutive |  |  | 85.5 |  |  |  | 85.0 |  |  |  | 84.6 |
Dilutive net income per common share |  | $ | 1.24 |  |  | $ | 1.49 |  |  | $ | 0.19 |
Anti-dilutive shares outstanding, excluded from computation |  |  | 0.3 |  |  |  | 0.8 |  |  |  | 0.6 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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