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Common Stock (Details) - USD ($)	3 Months Ended		6 Months Ended		237 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Common stock, outstanding	53,747,352		53,747,352		53,747,352	54,755,900
Common stock, issued	36,044	60,155	127,287	161,850
Common stock, dividend, per share			$ 0.13
Number of shares repurchased			1,100,000		18,700,000
Stock repurchased (in US dollars)	$ 125,113,000		$ 138,030,000	$ 99,048,000	$ 1,042,100,000
Remaining authorized repurchase amount (in US dollars)	107,900,000		107,900,000		107,900,000
RepurchaseProgramSep2011toJun2021
Equity, Class of Treasury Stock [Line Items]
Stock repurchase, authorized amount (in US dollars)	$ 1,150,000,000		$ 1,150,000,000		$ 1,150,000,000

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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