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Common Stock and Treasury Stock - Additional Information (Details) - USD ($)	12 Months Ended			34 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Feb. 28, 2018
Equity [Abstract]
Repurchase program, amount approved for repurchase					$ 200,000,000.0
Repurchase program, shares repurchased (in shares)	1,000,000	1,228,102	2,346,427	46,357,495
Repurchase program, shares repurchased, value	$ 28,881,000	$ 35,617,000	$ 54,527,000	$ 612,300,000
Repurchase program, maximum remaining amont authorized for purchase	$ 112,100,000			$ 112,100,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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