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Share Repurchases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Feb. 19, 2020	Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]
Number of Shares (in shares)	693,157	11,008	822,533	160,132
Average Price per Share (usd per share)	$ 40.89	$ 22.79	$ 39.35	$ 25.74
Value of common stock repurchases	$ 28,000,000	$ 0	$ 32,000,000	$ 4,000,000
Number of shares (in shares)	11,873	11,008	141,249	160,132
Average price per share (usd per share)	$ 40.97	$ 22.79	$ 31.90	$ 25.74
Value of common stock repurchases	$ 0	$ 0	$ 4,000,000	$ 4,000,000
Stock repurchase program, authorized amount					$ 350,000,000	$ 350,000,000
Share Repurchase Program Twenty Fourteen
Equity, Class of Treasury Stock [Line Items]
Number of Shares (in shares)	681,284	0	681,284	0
Average Price per Share (usd per share)	$ 40.89	$ 0	$ 40.89	$ 0
Value of common stock repurchases	$ 28,000,000	$ 0	$ 28,000,000	$ 0

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Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation, Share Price

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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