Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 08, 2020
Valuation Allowance [Line Items]
Income tax expense (benefit)	$ 1.4	$ (1.0)	$ 9.8	$ (5.7)
Effective tax rate			(15.50%)
Tax benefits realized which must be paid (as a percent)			85.00%
Expected benefit from remaining cash savings (as a percent)			15.00%
Projected obligations under Tax Receivable Agreements	$ 182.6		$ 182.6
IPO, outside basis differences in partnership subsidiaries
Valuation Allowance [Line Items]
Valuation allowance					$ 224.4
Second Offering, outside basis differences in partnership subsidiaries
Valuation Allowance [Line Items]
Valuation allowance					92.9
Basis in corporate stock of wholly owned subsidiary
Valuation Allowance [Line Items]
Valuation allowance					$ 207.4