DEBT - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Obligations under finance leases	$ 14.8	$ 16.3
Total debt	1,422.4	1,305.2
Less: current portion of total debt	17.3	19.6
Less: unamortized debt issuance costs	6.5	7.8
Long-term portion of total debt	1,398.6	1,277.8
$600 million Senior Notes, due in 2024 (redeemed in March 2024) \| Senior notes
Debt Instrument [Line Items]
Long-term debt	0.0	600.0
$500 million Senior Notes, due in 2029 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	500.0	500.0
Promissory notes and deferred consideration \| Promissory note
Debt Instrument [Line Items]
Long-term debt	29.0	32.9
$1.2 billion Credit Facility, due in 2026 \| Credit agreement amended, due in 2026 \| Line of credit
Debt Instrument [Line Items]
Long-term debt	753.6	31.0
$125 million Term Loan, due in 2026 \| Credit agreement amended, due in 2026 \| Line of credit
Debt Instrument [Line Items]
Long-term debt	$ 125.0	$ 125.0

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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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