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Related Party Transactions - Other (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transactions
Expenses incurred		$ 37,050,000	$ 31,223,000	$ 105,275,000	$ 101,332,000
Related Party
Related Party Transactions
Expenses incurred		0	800,000	600,000	2,500,000
Related Party | Westrock Group, LLC
Related Party Transactions
Expenses incurred	$ 10,000,000.0	500,000	$ 300,000	1,300,000	$ 1,000,000.0
Related Party | Accrued expenses and other current liabilities | Westrock Group, LLC
Related Party Transactions
Short-term related party debt		$ 0		$ 0		$ 0

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