Stockholders' Equity - Exchange Agreement (Details) shares in Millions		3 Months Ended		6 Months Ended	9 Months Ended
	May 03, 2017	Sep. 30, 2021 shares	Sep. 30, 2020 shares	Jun. 30, 2019	Sep. 30, 2021 shares	Sep. 30, 2020 shares
Limited Partners' Capital Account [Line Items]
Conversion ratio					1.25
Class B Common Stock
Limited Partners' Capital Account [Line Items]
Conversion ratio	0.8
Exchange Agreement
Limited Partners' Capital Account [Line Items]
LLC units received (in shares)		3			11	2
Exchange Agreement | Class B Common Stock
Limited Partners' Capital Account [Line Items]
Conversion of stock, converted (in shares)		2	1		8	1
Exchange Agreement | Class A Common Stock
Limited Partners' Capital Account [Line Items]
Conversion ratio	0.8
Conversion of stock, issued (in shares)		3	1		9	1
Class A Units
Limited Partners' Capital Account [Line Items]
Conversion ratio				0.8
Class A Units | Exchange Agreement
Limited Partners' Capital Account [Line Items]
Conversion of stock, converted (in shares)		3	1		11	2
LLC units received (in shares)		3	1		11	2