Shareholders' Equity (Details) - USD ($)	3 Months Ended					9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Oct. 30, 2018	Oct. 29, 2018	Apr. 25, 2017
Distribution Made to Limited Partner [Line Items]
Authorized stock repurchase amount									$ 250,000,000.0
Remaining unused authorization for stock repurchase program								$ 78,300,000
Repurchase aggregate cost		$ 27,900,000	$ 25,000,000.0	$ 18,000,000.0	$ 25,000,000.0
October 2018 Stock Repurchase Program
Distribution Made to Limited Partner [Line Items]
Authorized stock repurchase amount							$ 300,000,000.0
Remaining unused authorization for stock repurchase program	$ 147,100,000					$ 147,100,000
Repurchase of common stock (in shares)	0					235,590
Repurchase aggregate cost						$ 27,900,000