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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 2024
Equity [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2024 and 2023, respectively.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions, except per share data) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Numerator: |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 30.6 |  |  | $ | 35.6 |  |  | $ | 84.4 |  |  | $ | 211.1 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  | 175.2 |  |  | 176.9 |  |  | 175.6 |  |  | 177.7 |
Dilutive effect of share-based awards and options outstanding |  | 0.7 |  |  | 0.9 |  |  | 0.5 |  |  | 0.8 |
Weighted average diluted common shares outstanding (1) |  | 175.9 |  |  | 177.7 |  |  | 176.1 |  |  | 178.5 |
Basic earnings per common share |  | $ | 0.17 |  |  | $ | 0.20 |  |  | $ | 0.48 |  |  | $ | 1.19 |
Diluted earnings per common share |  | 0.17 |  |  | 0.20 |  |  | 0.48 |  |  | 1.18 |
(1)Weighted average diluted common shares outstanding may not sum due to rounding.
Schedule of Common Shares Outstanding Roll Forward | The following table shows changes to our Class B common shares outstanding for the three and nine months ended September 30, 2024 and 2023.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Outstanding at beginning of period |  | 92,301,573 |  |  | 94,064,251 |  |  | 92,931,242 |  |  | 94,993,144 |
Repurchases of common stock |  | (145,896) |  |  | (497,435) |  |  | (1,289,769) |  |  | (1,869,474) |
Share issuances |  | — |  |  | 219 |  |  | 698,133 |  |  | 681,642 |
Exercise of employee stock options |  | — |  |  | — |  |  | 71,529 |  |  | 6,000 |
Shares withheld for employee taxes |  | — |  |  | — |  |  | (255,458) |  |  | (244,277) |
Outstanding at end of period |  | 92,155,677 |  |  | 93,567,035 |  |  | 92,155,677 |  |  | 93,567,035 |

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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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