Tax Receivable Agreement (Details) - USD ($) $ in Millions		6 Months Ended
	Feb. 12, 2018	Jun. 30, 2019
Tax receivable agreement
Tax savings payable to TRA Holders (as a percent)	85.00%
Tax savings benefit recorded as APIC (as a percent)	15.00%
Total liability from Tax Receivable Agreement		$ 230.6
Amount of expected change in benefits subject to the TRA from stock price increases or decreases, as a percentage of the tax-effected change in price		125.00%
Amount of expected change in undiscounted amounts payable under the TRA from stock price changes, as a percentage of the tax-effected change in price		106.00%
Payment period, after redemption	20 years
Variable reference rate	One-year LIBOR
TRA payment period		5 days
Minimum
Tax receivable agreement
Aggregate payment period	25 years
One-year LIBOR
Tax receivable agreement
Applicable margin rate (as a percent)	1.50%
Variable interest rate, deferral period		5.50%