FAIR VALUE MEASUREMENTS - Schedule of Fair Values of Financial Liabilities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Financial assets required to be measured at fair value	$ 0	$ 0
Financial liabilities required to be measured at fair value	0	0
Liabilities:
Long-term debt, including current portion, Fair Value	2,531,200,000	2,168,900,000
Long-term debt, including current portion, Carrying Value	3,466,100,000	3,322,500,000
Level 1
Liabilities:
Long-term debt, including current portion, Fair Value	0	0
Level 2
Liabilities:
Long-term debt, including current portion, Fair Value	2,531,200,000	2,168,900,000
Level 3
Liabilities:
Long-term debt, including current portion, Fair Value	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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