Amount of amortization expense attributable to debt issuance costs.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate of long-term debt outstanding calculated over time.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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Long-Term Debt - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 12, 2021	Dec. 31, 2020	Apr. 15, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2017
Debt Instrument [Line Items]
Term Loan	$ 675,000,000	$ 675,000,000			$ 772,000,000
Letters of credit outstanding	0	0
Repayments of lines of credit		97,000,000	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	200,000,000	200,000,000
Revolving credit facility	$ 0	0
Line of credit facility, maximum amount outstanding during period		$ 200,000,000
Senior Secured First Lien Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount							$ 1,000,000,000		$ 900,000,000
Senior Secured First Lien Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 200,000,000	$ 100,000,000	100,000,000
Senior Secured First Lien Credit Facility \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 240,000,000
Senior Secured First Lien Credit Facility \| Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount									$ 800,000,000
Credit Facility
Debt Instrument [Line Items]
Debt, weighted average interest rate	3.75%	3.75%
Credit Facility \| Term Loan
Debt Instrument [Line Items]
Term Loan	$ 675,000,000	$ 675,000,000
Credit Facility \| Term Loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of lines of credit	$ 50,000,000	97,000,000
Accelerated amortization of debt issuance costs		$ 800,000
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Debt instrument, face amount						$ 375,000,000
Debt instrument interest stated percentage						7.625%
Debt, weighted average interest rate	5.10%	5.13%