Debt	3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt First Lien Credit Agreement Amendment On March 16, 2018, the Company entered into an Incremental Assumption and Amendment Agreement No.6 (the “2018 First Lien Credit Agreement Amendment”), which further amended and restated the First Lien Credit Agreement (the First Lien Credit Agreement, as amended, restated, supplemented or otherwise waived prior to the effective date of the 2018 First Lien Credit Agreement Amendment (the “Existing Credit Agreement”) and, as amended by the 2018 First Lien Credit Agreement Amendment (the “Amended and Restated Credit Agreement”)). Prior to the effectiveness of the 2018 First Lien Credit Agreement Amendment, the Existing Credit Agreement included a revolving credit facility of $255 million maturing on May 2, 2021, and a revolving credit facility of $95 million maturing on July 1, 2020. In connection with the 2018 First Lien Credit Agreement Amendment, the existing revolving credit facilities were replaced with a first lien revolving credit facility with an aggregate commitment of up to $350 million maturing on March 16, 2023, subject to the repayment, extension, or refinancing with longer maturity debt of certain of the Company’s other indebtedness (the “2023 Revolving Credit Facility”). Borrowings under the 2023 Revolving Credit Facility will bear interest at a rate equal to, at the Company’s option, either (a) a London Interbank Offered Rate (“LIBOR”) rate determined by reference to the costs of funds for Eurodollar deposits for the interest period relevant to such borrowing, adjusted for certain additional costs, or (b) a base rate determined by reference to the highest of (i) the federal funds rate plus 0.50% per annum, (ii) the prime rate of Barclays Bank PLC, and (iii) one-month adjusted LIBOR plus 1.00% per annum, in each case, plus the applicable margin of 2.75% for LIBOR loans and 1.75% for base rate loans. The applicable margin for borrowings under the 2023 Revolving Credit Facility is subject to one step-down based on a certain specified net first lien leverage ratio. In addition, the Amended and Restated Credit Agreement requires the Company to pay a commitment fee between 0.375% and 0.50% (determined based on a net first lien leverage ratio) in respect of the unused commitments under the 2023 Revolving Credit Facility. The term loan facilities under the Amended and Restated Credit Agreement continue to have the same terms as provided under the Existing Credit Agreement. Additionally, the parties to the Amended and Restated Credit Agreement continue to have the same obligations set forth in the Existing Credit Agreement. In connection with the Amended and Restated Credit Agreement, the Company recorded an immaterial loss on extinguishment of debt for the three months ended March 31, 2018 associated with the write off of a portion of the unamortized debt issuance costs relating to the Existing Credit Agreement. As of March 31, 2018, the Company had $350 million in available borrowing capacity under its 2023 Revolving Credit Facility. Prime Notes On February 21, 2018, the Company redeemed $594 million aggregate principal amount of the Prime Notes using a portion of the net proceeds received from the IPO, and incurred a loss on extinguishment of debt of $62 million related to the payment of the call premium and the write-off of a portion of the unamortized debt issuance costs. See Note 1 “Basis of Presentation and Summary of Significant Accounting Policies” for further discussion on the fair value of the Company’s debt.

Debt

First Lien Credit Agreement Amendment

On March 16, 2018, the Company entered into an Incremental Assumption and Amendment Agreement No.6 (the “2018 First Lien Credit Agreement Amendment”), which further amended and restated the First Lien Credit Agreement (the First Lien Credit Agreement, as amended, restated, supplemented or otherwise waived prior to the effective date of the 2018 First Lien Credit Agreement Amendment (the “Existing Credit Agreement”) and, as amended by the 2018 First Lien Credit Agreement Amendment (the “Amended and Restated Credit Agreement”)).

Prior to the effectiveness of the 2018 First Lien Credit Agreement Amendment, the Existing Credit Agreement included a revolving credit facility of $255 million maturing on May 2, 2021, and a revolving credit facility of $95 million maturing on July 1, 2020. In connection with the 2018 First Lien Credit Agreement Amendment, the existing revolving credit facilities were replaced with a first lien revolving credit facility with an aggregate commitment of up to $350 million maturing on March 16, 2023, subject to the repayment, extension, or refinancing with longer maturity debt of certain of the Company’s other indebtedness (the “2023 Revolving Credit Facility”). Borrowings under the 2023 Revolving Credit Facility will bear interest at a rate equal to, at the Company’s option, either (a) a London Interbank Offered Rate (“LIBOR”) rate determined by reference to the costs of funds for Eurodollar deposits for the interest period relevant to such borrowing, adjusted for certain additional costs, or (b) a base rate determined by reference to the highest of (i) the federal funds rate plus 0.50% per annum, (ii) the prime rate of Barclays Bank PLC, and (iii) one-month adjusted LIBOR plus 1.00% per annum, in each case, plus the applicable margin of 2.75% for LIBOR loans and 1.75% for base rate loans. The applicable margin for borrowings under the 2023 Revolving Credit Facility is subject to one step-down based on a certain specified net first lien leverage ratio.

In addition, the Amended and Restated Credit Agreement requires the Company to pay a commitment fee between 0.375% and 0.50% (determined based on a net first lien leverage ratio) in respect of the unused commitments under the 2023 Revolving Credit Facility.

The term loan facilities under the Amended and Restated Credit Agreement continue to have the same terms as provided under the Existing Credit Agreement. Additionally, the parties to the Amended and Restated Credit Agreement continue to have the same obligations set forth in the Existing Credit Agreement.

In connection with the Amended and Restated Credit Agreement, the Company recorded an immaterial loss on extinguishment of debt for the three months ended March 31, 2018 associated with the write off of a portion of the unamortized debt issuance costs relating to the Existing Credit Agreement.

As of March 31, 2018, the Company had $350 million in available borrowing capacity under its 2023 Revolving Credit Facility.

Prime Notes

On February 21, 2018, the Company redeemed $594 million aggregate principal amount of the Prime Notes using a portion of the net proceeds received from the IPO, and incurred a loss on extinguishment of debt of $62 million related to the payment of the call premium and the write-off of a portion of the unamortized debt issuance costs.

See Note 1 “Basis of Presentation and Summary of Significant Accounting Policies” for further discussion on the fair value of the Company’s debt.