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Earnings Per Share Attributable to Common Stockholders (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share Attributable to Common Stockholders |
Computation of Basic and Diluted Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2023 |  | 2022 | ​ | ​ | 2023 |  | 2022
Net income available to common stockholders | ​ | $ | 77.4 | ​ | $ | 53.4 | ​ | $ | 44.2 | ​ | $ | 231.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic weighted average share outstanding | ​ | ​ | 181,860,026 | ​ | ​ | 110,760,339 | ​ | ​ | 151,343,397 | ​ | ​ | 110,705,182
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Share units | ​ | ​ | 460,400 | ​ | ​ | 397,274 | ​ | ​ | 545,905 | ​ | ​ | 423,767
Stock options | ​ | ​ | 489,973 | ​ | ​ | 547,489 | ​ | ​ | 515,528 | ​ | ​ | 552,695
Diluted average shares outstanding | ​ | ​ | 182,810,399 | ​ | ​ | 111,705,102 | ​ | ​ | 152,404,830 | ​ | ​ | 111,681,644
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income per share attributable to common shares: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 0.43 | ​ | $ | 0.48 | ​ | $ | 0.29 | ​ | $ | 2.09
Diluted | ​ | $ | 0.42 | ​ | $ | 0.48 | ​ | $ | 0.29 | ​ | $ | 2.07

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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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