Equity-based Compensation - Additional Information (Details) - QL Holdings LLC and Subsidiaries - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of vested units			39,617
Aggregate intrinsic value of vested shares			$ 10.1
Equity-based compensation expense recognized amount paid to redeem units exceeded fair value at redemption	$ 0.0	$ 0.0	0.8	$ 1.3
Cash used to settle redemptions	$ 0.0	$ 1.1	$ 2.2	$ 5.8
Class B Units
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of vested units			82,161	49,242
Number of unvested units	95,139	103,558	95,139	103,558
Weighted average grant date fair value per unit, vested			$ 55.96	$ 42.93
Weighted average grant date fair value per unit, unvested	$ 87.79	$ 70.43	$ 87.79	$ 70.43
Aggregate intrinsic value of unvested shares	$ 38.1		$ 38.1
Unrecognized compensation cost	$ 8.2	$ 6.4	$ 8.2	$ 6.4
Weighted-average period for recognize compensation cost			3 years 1 month 6 days	3 years 3 months 18 days
Class B Units | QLH Class B Restricted Unit Plan
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of units issued	177,300		177,300
Number of units remained available for future grant	0		0
Class B Units | QLH Class B Restricted Unit Plan | Four-year Vesting Period
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period			4 years
Vesting percentage			25.00%