Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The following events or transactions have occurred subsequent to March 31, 2021: On April 21, 2021, the Company consummated the acquisition of NIC contemplated by the Agreement and Plan of Merger dated February 9, 2021, (the “Merger Agreement”), by and among the Company, Topos Acquisition, Inc., a Delaware corporation and wholly owned subsidiary of the Company (“Merger Sub”), and NIC. On April 21, 2021, Merger Sub merged with and into NIC, with NIC surviving as a wholly owned subsidiary of the Company (the “Merger”). As result of the Merger, NIC became a direct subsidiary of the Company and NIC’s subsidiaries became indirect subsidiaries of the Company. In connection with the completion of the Merger and on the Closing Date, the Company, as borrower, entered into a new $1.4 billion Credit Agreement with the various lenders party thereto and Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender, and Issuing Lender. The New Credit Agreement provides for (1) a senior unsecured revolving credit facility in an aggregate principal amount of up to $500 million, including sub-facilities for standby letters of credit and swingline loans (the “Revolving Credit Facility”), (2) an amortizing five-year term loan in the aggregate amount of $600 million (the “Term Loan A-1”), and (3) a non-amortizing three-year term loan in the aggregate amount of $300 million (the “Term Loan A-2”) and, together (the “Term Loans”). The New Credit Agreement matures on April 21, 2026, and the loans may be prepaid at any time, without premium or penalty, subject to certain minimum amounts and payment of any LIBOR breakage costs. In addition to the required amortization payments on the Term Loan A-1 of 5% annually, certain mandatory quarterly prepayments of the Term Loans and the Revolving Credit Facility will be required (i) upon the issuance or incurrence of additional debt not otherwise permitted under the New Credit Agreement and (ii) upon the occurrence of certain asset sales and insurance and condemnation recoveries, subject to certain thresholds, baskets, and reinvestment provisions as provided in the New Credit Agreement. The New Credit Agreement replaces and terminates the Company’s existing $400 million credit facility pursuant to the Credit Agreement dated as of September 30, 2019 (the “2019 Credit Agreement”). The Company’s previously announced commitment from Goldman Sachs Bank USA for a $1.6 billion 364-day senior unsecured bridge loan facility also terminated on the Closing Date. Borrowings under the Revolving Credit Facility and the Term Loan A-1 will bear interest, at the Company’s option, at a per annum rate of either (1) the Administrative Agent’s prime commercial lending rate (subject to certain higher rate determinations) (the “Base Rate”) plus a margin of 0.125% to 0.75% or (2) the one-, three-, six-, or, subject to approval by all lenders, twelve-month LIBOR rate plus a margin of 1.125% to 1.75%. The Term Loan A-2 will bear interest, at the Company’s option, at a per annum rate of either (1) the Base Rate plus a margin of 0.00% to 0.50% or (2) the one-, three-, or six-, or, subject to approval by all lenders, twelve-month LIBOR rate plus a margin of 0.875% to 1.50%. The margin in each case is based upon the Company’s total net leverage ratio, as determined pursuant to the New Credit Agreement. The New Credit Agreement has customary benchmark replacement language with respect to the replacement of LIBOR once LIBOR becomes unavailable. In addition to paying interest on the outstanding principal of loans under the Revolving Credit Facility, the Company is required to pay a commitment fee on the average daily unused portion of the Revolving Credit Facility, initially 0.25% per annum, ranging from 0.15% to 0.30% based upon the Company’s total net leverage ratio. On the Closing date, the Company paid approximately $2.3 billion in cash for the purchase of NIC. The Term Loans of $900 million and a portion of the proceeds of the Revolving Credit Facility, in the amount of $250 million, together with cash available to the Company of $609 million and the proceeds of its Convertible Senior Notes of $594 million, were used to complete the Merger, and pay fees and expenses in connection with the Merger and the New Credit Agreement. The remaining portion of the Revolving Credit Facility may be used for working capital requirements, acquisitions, and capital expenditures of the Company and its subsidiaries. The foregoing is a summary of the material terms and conditions of the New Credit Agreement and not a complete description of the New Credit Agreement. Accordingly, the foregoing is qualified in its entirety by reference to the full text of the New Credit Agreement attached to the Current Report on Form 8-K as Exhibit 10.1, dated April 21, 2021, which is incorporated by reference herein.