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Subsequent Events (Details) - USD ($)				3 Months Ended
	Apr. 21, 2021	Mar. 09, 2021	Sep. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Subsequent Event
Cash purchase of NIC				$ 12,049,000	$ 261,000
Proceeds from line of credit				0	$ 0
Convertible Senior Notes Due 2026 | Senior Notes
Subsequent Event
Net proceeds from issuance		$ 591,400,000		$ 594,000,000
Revolving Credit Facility | 2019 Credit Agreement
Subsequent Event
Revolving credit facility, maximum borrowing capacity			$ 400,000,000
Revolving Credit Facility | 2019 Credit Agreement | Minimum | Libor Rate
Subsequent Event
Line of credit facility interest rate			1.125%
Revolving Credit Facility | 2019 Credit Agreement | Maximum | Libor Rate
Subsequent Event
Line of credit facility interest rate			1.75%
Subsequent Event | NIC
Subsequent Event
Cash purchase of NIC	$ 2,300,000,000
Subsequent Event | Bridge Loan
Subsequent Event
Debt Instrument, Term	364 days
Line of credit facility, current borrowing capacity	$ 1,600,000,000
Subsequent Event | Revolving Credit Facility
Subsequent Event
Line of credit facility, cash available	609,000,000
Subsequent Event | Revolving Credit Facility | New Credit Agreement
Subsequent Event
Revolving credit facility, maximum borrowing capacity	1,400,000,000
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility
Subsequent Event
Revolving credit facility, maximum borrowing capacity	$ 500,000,000
Commitment fee (percent)	0.25%
Proceeds from line of credit	$ 250,000,000
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Minimum
Subsequent Event
Commitment fee (percent)	0.15%
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Minimum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.125%
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Minimum | Libor Rate
Subsequent Event
Line of credit facility interest rate	1.125%
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Maximum
Subsequent Event
Commitment fee (percent)	0.30%
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Maximum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.75%
Subsequent Event | Revolving Credit Facility | Senior Revolving Credit Facility | Maximum | Libor Rate
Subsequent Event
Line of credit facility interest rate	1.75%
Subsequent Event | Revolving Credit Facility | Term Loan A-1
Subsequent Event
Revolving credit facility, maximum borrowing capacity	$ 600,000,000
Quarterly prepayment fee (percent)	5.00%
Debt Instrument, Term	5 years
Subsequent Event | Revolving Credit Facility | Term Loan A-1 | Minimum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.125%
Subsequent Event | Revolving Credit Facility | Term Loan A-1 | Minimum | Libor Rate
Subsequent Event
Line of credit facility interest rate	1.125%
Subsequent Event | Revolving Credit Facility | Term Loan A-1 | Maximum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.75%
Subsequent Event | Revolving Credit Facility | Term Loan A-2
Subsequent Event
Revolving credit facility, maximum borrowing capacity	$ 300,000,000
Debt Instrument, Term	3 years
Subsequent Event | Revolving Credit Facility | Term Loan A-2 | Minimum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.00%
Subsequent Event | Revolving Credit Facility | Term Loan A-2 | Minimum | Libor Rate
Subsequent Event
Line of credit facility interest rate	0.875%
Subsequent Event | Revolving Credit Facility | Term Loan A-2 | Maximum | Base Rate
Subsequent Event
Line of credit facility interest rate	0.50%
Subsequent Event | Revolving Credit Facility | Term Loan A-2 | Maximum | Libor Rate
Subsequent Event
Line of credit facility interest rate	1.50%
Subsequent Event | Revolving Credit Facility | Term Loan
Subsequent Event
Proceeds from line of credit	$ 900,000,000

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