LONG-TERM DEBT - Schedule Of Long-Term Debt Outstanding (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 6,004,986,000	$ 6,016,930,000
Original issue discount	(18,020,000)	(18,817,000)
Long-term debt fees	(21,063,000)	(21,797,000)
Less: Current portion	28,628,000	34,775,000
Total long-term debt	5,976,358,000	5,982,155,000
Secured Debt
Debt Instrument [Line Items]
Long-term debt	4,593,799,000	4,600,762,000
Term Loan Facility due 2026 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	2,075,005,000	2,080,259,000
Incremental Term Loan Facility Due 2026 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	446,625,000	447,750,000
Asset-based Revolving Credit Facility due 2023 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	0	0
Asset-based Revolving Credit Facility due 2023 \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowings provided under credit facility	348,500,000
Outstanding borrowings under facility	0
Letters of credit outstanding	32,100,000
Line of credit, excess availability	316,400,000
Line of credit, amount available to be drawn	178,000,000
6.375% Senior Secured Notes due 2026 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 800,000,000	800,000,000
Stated interest rate (as a percent)	6.375%
5.25% Senior Secured Notes due 2027 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 750,000,000	750,000,000
Stated interest rate (as a percent)	5.25%
4.75% Senior Secured Notes due 2028 \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 500,000,000	500,000,000
Stated interest rate (as a percent)	4.75%
Other secured subsidiary debt \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 22,169,000	22,753,000
8.375% Senior Unsecured Notes due 2027 \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	$ 1,450,000,000	1,450,000,000
Stated interest rate (as a percent)	8.375%
Other unsecured subsidiary debt \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt	$ 270,000	$ 6,782,000

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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