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Stockholders' equity - Narrative (Details) shares in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 17, 2026 USD ($) | Dec. 31, 2025 USD ($) vote shares | Dec. 31, 2024 USD ($) shares | Apr. 23, 2025 USD ($) | Apr. 24, 2024 USD ($) | May 01, 2018 vote
Class of Stock [Line Items] |  |  |  |  |  |
Vote per share (in votes) | vote |  |  |  |  |  | 1
Common stock exchangeable shares |  | 1 |  |  |  |
Share repurchase program, authorized amount |  |  |  | $ 100,000,000 | $ 100,000,000 |
Stock repurchased and retired during period |  | $ 81,700,000 | $ 63,200,000 |  |  |
Class A Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares outstanding (in shares) | shares |  | 24,653 | 24,668 |  |  |
Vote per share (in votes) | vote |  | 1 |  |  |  |
Stock repurchased and retired during period (in shares) | shares |  | 1,014 | 1,045 |  |  |
Remaining authorization under the share repurchase program |  | $ 18,300,000 |  |  |  |
Class A Common Stock | Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Remaining authorization under the share repurchase program | $ 198,300,000 |  |  |  |  |
Share repurchase program, increase, amount | $ 180,000,000.0 |  |  |  |  |
Class B Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares outstanding (in shares) | shares |  | 11,935 | 12,620 |  |  |
Vote per share (in votes) | vote |  | 1 |  |  |  |

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