Redeemable Preferred Stock - Additional Information (Details) - USD ($)		9 Months Ended
	Aug. 31, 2017	Sep. 30, 2020	Dec. 31, 2019
Temporary Equity [Line Items]
Dividends payable		$ 0	$ 0
Series A Preferred Stock
Temporary Equity [Line Items]
Cumulative preferred dividends		$ 98,700,000
Preferred dividends payable (in USD per share)		$ 318.30
Bain Capital Private Equity, L.P. | Series A Preferred Stock
Temporary Equity [Line Items]
Stock issued during period (shares)	310,000
Purchase price per share (in USD per share)	$ 1,000
Proceeds from issuance of preferred shares	$ 310,000,000.0