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Common Stock (Details) - USD ($)	3 Months Ended		6 Months Ended		225 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Common stock, outstanding	54,897,926		54,897,926		54,897,926	56,219,831
Common stock, issued	60,155	44,514	161,850	145,461
Common stock, dividend, per share			$ 0.08
Number of shares repurchased			1,500,000		17,400,000
Stock repurchased (in US dollars)			$ 99,048,000		$ 890,500,000
Remaining authorized repurchase amount (in US dollars)	$ 259,500,000		259,500,000		259,500,000
RepurchaseProgramSep2011toJun2020
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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