Debt and Other Financing - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) day shares	Mar. 31, 2021 USD ($)	Mar. 24, 2021 USD ($)
Debt Instrument
Increased additional paid-in capital		$ 251,000,000
Convertible Debt
Debt Instrument
Interest expense	$ 6,000,000	5,000,000
Debt discount amortization	$ 2,000,000	2,000,000
Senior Secured Revolving Credit Facility
Debt Instrument
EBITDA ratio (in percentage)	4.0
Subject to step-up permitted acquisition Ratio (in percentage)	0.5
2025 Accreting Notes
Debt Instrument
Annual effective interest rate (in percentage)	2.70%
2025 Accreting Notes | Convertible Debt
Debt Instrument
Annual coupon rate (in percentage)	2.50%
Number of trading days (whether or not consecutive) | day	20
Number of trading days (consecutive) | day	30
Debt conversion stock price (in percentage)	276.00%
Principal amount of notes	$ 1,000
Principal amount to be redeemed (in percentage)	100.00%
Debt, fair value	$ 55,000,000
2025 Accreting Notes | Convertible Debt | Class A common stock
Debt Instrument
Increased additional paid-in capital	0	$ 251,000,000
2025 Accreting Notes | Convertible Debt | Great Hill | Class A common stock
Debt Instrument
Debt conversion, principal amount	$ 253,000,000
Debt conversion, converted, shares issued (in shares) | shares	3,490,175
Non-Accreting Notes | Convertible Debt
Debt Instrument
Number of trading days (whether or not consecutive) | day	20
Number of trading days (consecutive) | day	30
Debt conversion stock price (in percentage)	130.00%
Convertible debt business period (in days)	5 days
Consecutive debt measurement period (in days)	10 days
Principal amount of notes	$ 1,000
Measurement period, percentage (less than)	98.00%
2022 Notes | Convertible Debt
Debt Instrument
Annual coupon rate (in percentage)	0.375%
Annual effective interest rate (in percentage)	0.90%
Debt, fair value	$ 3,000,000
Convertible debt, if-converted value in excess of principal	$ 1,000,000
2024 Notes | Convertible Debt
Debt Instrument
Annual coupon rate (in percentage)	1.125%
Annual effective interest rate (in percentage)	1.50%
Debt, fair value	$ 714,000,000
2026 Notes | Convertible Debt
Debt Instrument
Annual coupon rate (in percentage)	1.00%
Annual effective interest rate (in percentage)	1.20%
Debt, fair value	$ 1,000,000,000
2025 Notes | Convertible Debt
Debt Instrument
Annual coupon rate (in percentage)	0.625%
Annual effective interest rate (in percentage)	0.90%
Debt, fair value	$ 1,200,000,000
Convertible debt, if-converted value in excess of principal	$ 19,000,000
Revolving Credit Facility
Debt Instrument
Borrower and guarantor obligations under debt agreement, capital stock of first-tier foreign subsidiaries (in percentage)	65.00%
Revolving Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument
Basis spread (in percentage)	1.00%
Revolving Credit Facility | LIBOR
Debt Instrument
Basis spread (in percentage)	1.00%
Applicable margin (in percentage)		0.0125
Revolving Credit Facility | Base Rate
Debt Instrument
Applicable margin (in percentage)		0.0025
Revolving Credit Facility | Risk Free Rate
Debt Instrument
Applicable margin (in percentage)		0.012826
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) Swap Rate
Debt Instrument
Applicable margin (in percentage)	0.0000
Revolving Credit Facility | Senior Secured Revolving Credit Facility
Debt Instrument
Maximum borrowing capacity			$ 600,000,000
Borrowings under Revolver credit agreement	$ 0
Letters of credit outstanding	$ 62,000,000
Replaced Revolver | Senior Secured Revolving Credit Facility
Debt Instrument
Maximum borrowing capacity			$ 200,000,000