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Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
		Jan. 01, 2021	Jun. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2013	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted				28,250		140,569
Weighted average grant date fair value of options granted				$ 29.13		$ 21.15
Tax benefits in relation to equity-based compensation				$ 2.2	$ 3.4	$ 15.7	$ 5.1
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation cost				$ 1.4	$ 1.0	$ 3.7	$ 2.4
Class A Common Stock | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock unit granted				0		28,224
Weighted average grant date fair value of RSUs granted	[1]					$ 48.16
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity incentive plans award term								10-year
Equity incentive plans vesting period								5 years
2013 Equity Incentive Plan | Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost				$ 11.9		$ 11.9
Total unrecognized compensation cost to be recognized, weighted average service period						3 years 2 months 12 days
Amendment to 2013 Equity Incentive Plan | Class A Common Stock | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for issuance									6,207,978
2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance				4,900,000		4,900,000
Increase in number of shares reserved for future issuance, description						The number of shares that will be available for issuance under our 2019 Plan also will increase annually on the first day of each year beginning in 2020, in an amount equal to the least of: (a) 6,900,000 shares, (b) 5% of the outstanding shares of all classes of our common stock as of the last day of the immediately preceding year and (c) such other amount as our board of directors may determine
Increase in number of shares reserved for future issuance, shares		2,000,000.0	6,900,000
Percentage of number of shares of common stock outstanding			5.00%
2019 Equity Incentive Plan | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost				$ 11.9		$ 11.9
Total unrecognized compensation cost to be recognized, weighted average service period						3 years 2 months 12 days
2019 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance			4,500,000
2019 Equity Incentive Plan | Class A Common Stock | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock unit granted	[1]					28,224
[1] Includes an adjustment of 11,763 shares underlying performance-based RSU awards made during the nine months ended September 30, 2021. The vesting of such RSUs is based upon the Company’s current performance against predefined financial targets.

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