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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 27, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 10, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 2,731 | 8,232 | 7,750 | 12,284 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 336,217 | $ 725,439 | $ 899,447 | $ 1,028,578 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 123.14 | $ 88.13 | $ 116.06 | $ 83.73 |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 2,000,000
Terminated Remaining Prior Share Repurchases Authorized, Amount |  |  |  |  |  | $ 329,302
Subsequent Event |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) | 1,229 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 139,538 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 113.54 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 890,970 |  |  |  |  |

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