Debt - Additional Information (Details)			12 Months Ended
	Apr. 21, 2021 USD ($)	Mar. 09, 2021 USD ($) trading_day $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Line Of Credit Facility
Cash and cash equivalents	$ 609,000,000		$ 309,171,000	$ 603,623,000
Outstanding borrowings			0	0
Letter of credit outstanding			2,000,000
NIC
Line Of Credit Facility
Cash to acquire business	2,300,000,000
Convertible Senior Notes Due 2026 | Senior Notes
Line Of Credit Facility
Net proceeds from issuance		$ 591,400,000	$ 594,000,000
Initial purchasers discount		6,000,000
Debt issuance costs		2,600,000
Debt instrument, interest rate, effective percentage			0.53%
Debt instrument face amount		$ 600,000,000	$ 600,000,000
Debt instrument, interest rate, stated percentage		0.25%
Common stock exceeds conversion price percentage		130.00%
Debt instrument, convertible, threshold trading days | trading_day		20
Observation period (days) | trading_day		30
Redemption percentage		100.00%
Initial conversion rate (shares)		0.20266%
Conversion price (usd per share) | $ / shares		$ 493.44
Consecutive trading days | trading_day		30
Credit Agreement
Line Of Credit Facility
Interest paid			$ 17,700,000
Revolving Credit Facility | 2021 Credit Agreement
Line Of Credit Facility
Revolving credit facility, maximum borrowing capacity	1,400,000,000
Net proceeds from issuance	1,100,000,000
Initial purchasers discount	7,200,000
Debt issuance costs	4,900,000
Debt instrument, interest rate, effective percentage			1.84%
Debt instrument face amount			$ 755,000,000
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility
Line Of Credit Facility
Revolving credit facility, maximum borrowing capacity	$ 500,000,000
Commitment fee (percent)	0.25%
Proceeds from line of credit	$ 250,000,000
Outstanding borrowings			0
Line of credit facility, unused borrowing capacity			500,000,000
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum
Line Of Credit Facility
Commitment fee (percent)	0.15%
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.125%
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	1.125%
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum
Line Of Credit Facility
Commitment fee (percent)	0.30%
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.75%
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	1.75%
Revolving Credit Facility | Term Loan A-1
Line Of Credit Facility
Revolving credit facility, maximum borrowing capacity	$ 600,000,000
Debt instrument, term	5 years
Quarterly prepayment fee (percent)	5.00%
Revolving Credit Facility | Term Loan A-1 | Minimum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.125%
Revolving Credit Facility | Term Loan A-1 | Minimum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	1.125%
Revolving Credit Facility | Term Loan A-1 | Maximum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.75%
Revolving Credit Facility | Term Loan A-1 | Maximum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	1.75%
Revolving Credit Facility | Term Loan A-2
Line Of Credit Facility
Revolving credit facility, maximum borrowing capacity	$ 300,000,000
Debt instrument, term	3 years
Revolving Credit Facility | Term Loan A-2 | Minimum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.00%
Revolving Credit Facility | Term Loan A-2 | Minimum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.875%
Revolving Credit Facility | Term Loan A-2 | Maximum | Base Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	0.50%
Revolving Credit Facility | Term Loan A-2 | Maximum | LIBOR Rate
Line Of Credit Facility
Line of credit facility interest rate (in percent)	1.50%
Revolving Credit Facility | Credit Agreement
Line Of Credit Facility
Debt instrument face amount			400,000,000
Revolving Credit Facility | Term Loan
Line Of Credit Facility
Proceeds from line of credit	$ 900,000,000
Revolving Credit Facility | Bridge Loan
Line Of Credit Facility
Commitment fees	6,400,000		6,407,000	0	$ 0
Unsecured bridge loan facility	$ 1,600,000,000
Debt instrument face amount						$ 1,600,000,000
Interest paid			$ 6,400,000	$ 600,000	$ 1,800,000