Redeemable Convertible Preferred Units and Stockholders'/Members' Equity (Deficit) (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 15, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Sep. 30, 2021 USD ($) votesPerShare votes $ / shares shares	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 11, 2019 shares
Class of Stock [Line Items]
Redeemable convertible preferred units authorized (in shares)			0		1,448,632,049					1,448,632,049
Common units authorized (in shares)			0		264,166,544					264,166,544
Preferred stock, shares authorized (in shares)			2,000,000,000
Preferred stock, par value (in usd per share) | $ / shares			$ 0.0001
Preferred stock, shares issued (in shares)			0		0
Preferred stock, shares outstanding (in shares)			0		0
Total stockholders'/members’ equity (deficit) | $		$ 3,275,125	$ 2,568,106	$ 2,802,629	$ (4,068,862)	$ (3,976,608)	$ (3,811,142)	$ (3,665,081)	$ (3,532,912)
Chief Executive Officer
Class of Stock [Line Items]
Conversion of redeemable convertible preferred units (in shares)	132,859,550
Common Units
Class of Stock [Line Items]
Conversion of common units into Class A and Class B common stock (in shares)		128,723,000
Common Units | PIUs
Class of Stock [Line Items]
Conversion of stock, conversion discount (in shares)	75,862
Accumulated Foreign Currency Adjustment Attributable to Parent
Class of Stock [Line Items]
Total stockholders'/members’ equity (deficit) | $			35,000		(4,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Class of Stock [Line Items]
Total stockholders'/members’ equity (deficit) | $			$ (34,000)		$ (27,000)
Common Class A
Class of Stock [Line Items]
Conversion of redeemable convertible preferred units (in shares)	1,196,605,432
Sale of stock, number of shares issued in transaction (in shares)	100,000,000
Sale of stock, price per share (in usd per share) | $ / shares	$ 35.00
Payments for underwriting discounts | $	$ 69,000
Common stock, shares authorized (in shares)			10,000,000,000		0
Common stock, par value (in usd per share) | $ / shares			$ 0.0001		$ 0.0001
Number of votes per share of common stock | votesPerShare			1
Common Class A | PIUs
Class of Stock [Line Items]
Shares converted (in shares)	22,367,358
Common Class A | IPO
Class of Stock [Line Items]
Shares converted (in shares)	1,200,000
Sale of stock, number of shares issued in transaction (in shares)	100,000,000
Sale of stock, price per share (in usd per share) | $ / shares	$ 35.00
Proceeds from issuance of Class A common stock upon initial public offering, net of underwriting discounts | $	$ 3,400,000
Payments for underwriting discounts | $	$ 69,000
Common Class A | Common Units
Class of Stock [Line Items]
Conversion of common units into Class A and Class B common stock (in shares)	85,579,584
Common Class A | Common Units | PIUs
Class of Stock [Line Items]
Shares converted (in shares)	22,443,220
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			250,000,000		0
Common stock, par value (in usd per share) | $ / shares			$ 0.0001		$ 0.0001
Number of votes per share of common stock | votes			29
Common Class B | IPO
Class of Stock [Line Items]
Shares converted (in shares)	(1,200,000)
Common Class B | Chief Executive Officer | PIUs
Class of Stock [Line Items]
Conversion of common units into Class A and Class B common stock (in shares)	43,143,440