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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Summary of Computation of Basic and Diluted Earnings Per Share | The following table summarizes the computation of basic and diluted earnings per common share (in millions, except per share data):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Earnings per common share—basic |  |  |  |  |  |  |
Net income | $ | 29.7 |  |  | $ | 38.5 |  |  | $ | 172.1 |  |  | $ | 230.6 |
Weighted-average common shares outstanding—basic | 185.2 |  |  | 184.8 |  |  | 185.2 |  |  | 184.9 |
Earnings per common share—basic | $ | 0.16 |  |  | $ | 0.21 |  |  | $ | 0.93 |  |  | $ | 1.25 |
Earnings per common share—diluted |  |  |  |  |  |  |
Net income | $ | 29.7 |  |  | $ | 38.5 |  |  | $ | 172.1 |  |  | $ | 230.6 |
Interest expense attributable to convertible notes | 1.6 |  |  | 1.6 |  |  | 4.8 |  |  | 4.8 |
Net income attributable to earnings per common share—diluted | $ | 31.3 |  |  | $ | 40.1 |  |  | $ | 176.9 |  |  | $ | 235.4 |
Weighted-average common shares outstanding—basic | 185.2 |  |  | 184.8 |  |  | 185.2 |  |  | 184.9 |
Convertible Notes weighted-average common shares outstanding | 14.7 |  |  | 14.7 |  |  | 14.7 |  |  | 14.7 |
Outstanding options, restricted stock units and performance share units | 1.3 |  |  | 2.3 |  |  | 1.4 |  |  | 1.4 |
Weighted-average common shares outstanding—diluted | 201.2 |  |  | 201.8 |  |  | 201.3 |  |  | 201.0 |
Earnings per common share—diluted | $ | 0.16 |  |  | $ | 0.20 |  |  | $ | 0.88 |  |  | $ | 1.17 |

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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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