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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 04, 2019 | Sep. 30, 2019 | Nov. 04, 2019 | Sep. 30, 2019 | Nov. 06, 2019 | Jul. 17, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 30,592 |  | 32,652 |  |
Value of treasury stock acquired |  | $ 1,747,968 |  | $ 1,860,157 |  |
Treasury stock acquired, average cost per share |  | $ 57.14 |  | $ 56.97 |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 2,000,000
Terminated Remaining Prior Share Repurchases Authorized, Amount |  |  |  |  |  | $ 1,005,605
Tender Offer |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 21,802 |  | 21,802 |  |
Value of treasury stock acquired |  | $ 1,233,886 |  | $ 1,233,886 |  |
Treasury stock acquired, average cost per share |  | $ 56.60 |  | $ 56.60 |  |
Subsequent Event |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) | 4,283 |  | 30,661 |  |  |
Value of treasury stock acquired | $ 245,544 |  | $ 1,753,627 |  |  |
Treasury stock acquired, average cost per share | $ 57.32 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 2,000,000 |  | 2,000,000 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 2,000,000 |
Terminated Remaining Prior Share Repurchases Authorized, Amount | $ 246,373 |  | $ 246,373 |  |  |

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