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Net Income Per Common Share Computations (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Calculation | The following is a reconciliation of the numerator and denominator of the net income per common share computations:
| Years Ended December 31,
(in millions, except per share data) | 2023 |  | 2022 |  | 2021
Numerator for basic net income per common share: |  |  |  |  |
Net income | $ | 417.3 |  |  | $ | 439.4 |  |  | $ | 249.1 |
Denominator for net income per common share: |  |  |  |  |
Basic | 75.2 |  |  | 75.9 |  |  | 77.2 |
Plus dilutive effect of stock awards | 0.9 |  |  | 1.1 |  |  | 1.2 |
Diluted | 76.1 |  |  | 77.0 |  |  | 78.4 |
Net income per common share data: |  |  |  |  |
Basic net income | $ | 5.55 |  |  | $ | 5.79 |  |  | $ | 3.22 |
Diluted net income | $ | 5.49 |  |  | $ | 5.71 |  |  | $ | 3.18 |

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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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