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Earnings per share - Schedule Of Common Stock Shares Equivalent Excluded From Calculation Of Diluted Earnings Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Class B Common Stock [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method |  |  |  |
Antidilutive securities | 82,021,389 | 82,021,389 | 82,021,389 | 82,021,389
Stock Option [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method |  |  |  |
Antidilutive securities | 39,511 | 0 | 14,869 | 0
Restricted Common Stock [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method |  |  |  |
Antidilutive securities | 7,051 | 5 | 27 | 635
Performance stock units [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method |  |  |  |
Antidilutive securities | 48,513 | 0 | 34,336 | 0

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