LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Obligations under finance leases	$ 19,800,000	$ 21,400,000
Total debt	1,705,600,000	1,623,700,000
Less: current portion of total debt	16,500,000	19,900,000
Less: unamortized debt issuance costs	12,800,000	14,000,000.0
Long-term portion of total debt	1,676,300,000	1,589,800,000
Line of credit \| $1.2 billion Credit Facility, due in 2026 \| Credit Agreement Amended Sept 2021
Debt Instrument [Line Items]
Long-term debt	339,700,000	247,000,000.0
Maximum borrowing capacity of line of credit facility	1,200,000,000
Line of credit \| $200 million Term Loan, due in 2026 \| Credit Agreement Amended Sept 2021
Debt Instrument [Line Items]
Long-term debt	200,000,000.0	200,000,000.0
Maximum borrowing capacity of line of credit facility	200,000,000
Senior Notes \| $600 million Senior Notes, due in 2024
Debt Instrument [Line Items]
Long-term debt	600,000,000.0	600,000,000.0
Maximum borrowing capacity of line of credit facility	600,000,000
Senior Notes \| $500 million Senior Notes, due in 2029
Debt Instrument [Line Items]
Long-term debt	500,000,000.0	500,000,000.0
Promissory notes and deferred consideration \| Promissory notes and deferred consideration (fixed rate)
Debt Instrument [Line Items]
Long-term debt	45,600,000	54,600,000
Foreign bank debt \| Foreign bank debt (variable rate)
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 700,000

Long-term Debt, Gross And Lease Obligation

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Present value of lessee's discounted obligation for lease payments from finance lease.

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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 long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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