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Earnings per Common Share (Tables) | 3 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Calculations of Basic and Diluted Earnings (Loss) per Common Share | The calculations of basic and diluted earnings per common share for the three months ended September 30, 2025 and 2024 were as follows:
|  | Three Months Ended September 30, |  |
(in millions, except per share data) |  | 2025 |  | 2024 |  |  |  |
Net income |  | $ | 122.5 |  |  | $ | 84.8 |  |  |  |  |
Dividends allocated to participating securities |  | — |  |  | (0.1) |  |  |  |  |
Earnings available for common stockholders used in calculation of basic earnings per common share |  | $ | 122.5 |  |  | $ | 84.7 |  |  |  |  |
Weighted average number of common shares outstanding, basic |  | 50.1 |  |  | 50.1 |  |  |  |  |
Basic earnings per common share |  | $ | 2.45 |  |  | $ | 1.69 |  |  |  |  |
Net income |  | $ | 122.5 |  |  | $ | 84.8 |  |  |  |  |
Dividends allocated to participating securities |  | — |  |  | (0.1) |  |  |  |  |
Earnings available for common stockholders used in calculation of diluted earnings per common share |  | $ | 122.5 |  |  | $ | 84.7 |  |  |  |  |
Weighted average number of common shares outstanding, basic |  | 50.1 |  |  | 50.1 |  |  |  |  |
Effect of shares issuable under share-based compensation plans |  | 0.3 |  |  | 0.6 |  |  |  |  |
Weighted average number of common shares outstanding, diluted |  | 50.4 |  |  | 50.7 |  |  |  |  |
Diluted earnings per common share |  | $ | 2.43 |  |  | $ | 1.67 |  |  |  |  |

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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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