Equity - Additional Information (Details) - USD ($)		3 Months Ended	9 Months Ended
	Sep. 13, 2017	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Oct. 07, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred Units, redemption price including declared and unpaid distributions (usd per share)					$ 25.339757
Preferred Units, redemption price (usd per share)					$ 25.25
Amount authorized for repurchase						$ 200,000,000.0
Shares/units repurchased (in shares)		0	1,100,000
Payments to repurchase units			$ 26,400,000	$ 34,500,000
Remaining authorized amount		$ 139,100,000	$ 139,100,000
5.875% Series A Preferred Units
Class of Stock [Line Items]
Preferred units, issued (in shares)	16,000,000
Dividend rate, percentage	5.875%
Proceeds from issuance of redeemable preferred stock, gross	$ 400,000,000.0
Proceeds from issuance of preferred units, net of offering costs and expenses	$ 387,500,000