LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Obligations under finance leases	$ 22.3	$ 24.8
Total debt	1,653.8	1,795.2
Less: current portion of total debt	18.0	91.0
Less: unamortized debt issuance costs	14.8	15.1
Long-term portion of total debt	1,621.0	1,689.1
Line of credit \| $1.2 billion Credit Facility, due in 2026 \| Credit Agreement Amended Sept 2021
Debt Instrument [Line Items]
Long-term debt	301.9	173.3
Line of credit \| $200 million Term Loan, due in 2026 \| Credit Agreement Amended Sept 2021
Debt Instrument [Line Items]
Long-term debt	200.0	422.5
Senior Notes \| $500 million Senior Notes, due in 2029
Debt Instrument [Line Items]
Long-term debt	500.0	500.0
Senior Notes \| $600 million Senior Notes, due in 2024
Debt Instrument [Line Items]
Long-term debt	600.0	600.0
Promissory notes and deferred consideration \| Promissory notes and deferred consideration (fixed rate)
Debt Instrument [Line Items]
Long-term debt	27.4	42.3
Foreign bank debt \| Foreign bank debt (variable rate)
Debt Instrument [Line Items]
Long-term debt	$ 2.2	$ 32.3

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

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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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