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Capital stock (Details) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 11, 2025 | Jun. 18, 2025 | Mar. 11, 2025 | Feb. 06, 2025 | Sep. 11, 2024 | Jun. 10, 2024 | Mar. 11, 2024 | Feb. 08, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized amount |  |  |  |  |  |  |  |  | $ 2,750,000,000 |  |  |  |  |  |  | $ 2,750,000,000 |  |  |  |
Shares repurchased and retired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,919,239 | 4,720,308 |  |  |
Common stock shares repurchased price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46.68 | $ 35.50 |  |  |
Expenses related to stock purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 978,000 | $ 294,000 |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  |  |  |  |  | $ 464,061,000 |  |  |  |  |  |  | $ 464,061,000 |  |  |  |
Increase in quarterly cash dividend (in percentage) |  |  |  | 11.00% |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in usd per share) |  |  |  |  |  |  |  |  | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.1525 | $ 0.1525 | $ 0.1525 | $ 0.1375 | $ 0.51 | $ 0.4575 |  | $ 0.61 | $ 0.55
Dividends common stock | $ 29,293,000 | $ 29,624,000 | $ 29,784,000 |  | $ 26,939,000 | $ 27,337,000 | $ 27,492,000 |  | $ 29,293,000 |  |  | $ 26,939,000 |  |  |  | $ 88,701,000 | $ 81,768,000 |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.68 |  |
Share Repurchase Open Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of common stock shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,944,000 | $ 167,562,000 |  |  |
Q1 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized amount |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  | $ 500,000 |  |  |  |

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