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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2025 | Aug. 01, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 05, 2024
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 3,067 | 2,655 | 6,727 | 4,774 |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 446,024 | $ 375,831 | $ 996,246 | $ 615,948 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 144.00 | $ 140.14 | $ 146.69 | $ 127.98 |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,000,000
Open Market Purchases |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 1,921 | 2,655 | 5,378 | 4,774 |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 275,761 | $ 375,831 | $ 793,982 | $ 615,948 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 142.15 | $ 140.14 | $ 146.25 | $ 127.98 |
Berkshire Repurchases |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 1,146 | 0 | 1,349 | 0 |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 170,263 | $ 0 | $ 202,264 | $ 0 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 147.11 | $ 0 | $ 148.45 | $ 0 |
Subsequent Event |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 2,749 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 393,461 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 141.68 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 557,971 | $ 557,971 |  |  |  |  |
Subsequent Event | Berkshire |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock (in shares) | 1,636 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 230,025 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 140.61 |  |  |  |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
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