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Shareholder's equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 20, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 04, 2019 | Jul. 17, 2019 | Jul. 11, 2018
Stock repurchases |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 41,020,000 | 16,844,000 | 12,967,000 |  |  |
Value of treasury stock acquired |  | $ 2,402,475 | $ 1,153,511 | $ 810,949 |  |  |
Treasury stock acquired, average cost per share |  | $ 58.57 | $ 68.48 | $ 62.54 |  |  |
Stock Repurchase Program, Additional Authorized Amount |  |  |  |  |  |  | $ 1,389,999
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  | $ 110,001
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 2,000,000 | $ 2,000,000 |
Terminated Remaining Prior Share Repurchases Authorized, Amount |  |  |  |  | $ 246,373 | $ 1,005,605 |
Charter documents and Delaware law: |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 5,000,000 | 5,000,000 |  |  |  |
Period During Which The Company Is Subject To Section 203 Of The Delaware General Corporation Law Limitation |  | 3 years |  |  |  |  |
Payments to Noncontrolling Interests |  | $ 68,019 | $ 28,082 | $ 5,357 |  |  |
Subsequent Event |  |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |
Repurchase of common stock (in shares) | 291,000 |  |  |  |  |  |
Value of treasury stock acquired | $ 21,794 |  |  |  |  |  |
Treasury stock acquired, average cost per share | $ 74.92 |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,681,701 |  |  |  |  |  |

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- Definition Period During Which The Company Is Subject To Section 203 Of The Delaware General Corporation Law limitation. The Company is subject to Section 203 of the Delaware General Corporation Law which, subject to exceptions, would prohibit the Company from engaging in any business combinations with any interested stockholder, as defined in that section, for a period three years following the date on which that stockholder became an interested stockholder. + References No definition available. + Details
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