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Earnings Per Share Attributable to Common Stockholders (Tables) | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share |
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Net income available to common stockholders |  | $ | 99.5 |  |  | $ | 100.7 |  |  | $ | 202.4 |  |  | $ | 197.8 |
Basic weighted average shares outstanding |  | 185,365,576 |  | 183,887,145 |  | 185,096,464 |  | 183,473,233
Weighted average effect of dilutive securities: |  |  |  |  |  |  |  |
Share units |  | 712,803 |  | 434,999 |  | 816,395 |  | 630,431
Stock options and employee share purchase plan |  | 570,753 |  | 590,440 |  | 589,689 |  | 643,154
Diluted weighted average shares outstanding |  | 186,649,132 |  | 184,912,584 |  | 186,502,548 |  |  | 184,746,818 |
Earnings per share available to common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 0.54 |  |  | $ | 0.55 |  |  | $ | 1.09 |  |  | $ | 1.08 |
Diluted |  | $ | 0.53 |  |  | $ | 0.54 |  |  | $ | 1.09 |  |  | $ | 1.07 |

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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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