Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Current maturities of short-term borrowings	$ 0.0	$ 9.3
Unamortized debt issuance costs and discounts	(14.3)	(15.1)
Total debt	1,835.7	1,648.0
Long-term debt	$ 1,835.7	1,638.7
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of March 31, 2025	5.523%
Debt, gross	$ 205.7	9.5
Term Loans \| 5-year Term Loan Facility
Debt Instrument [Line Items]
Average interest rate as of March 31, 2025	5.657%
Debt, gross	$ 825.0	825.0
Senior Notes \| Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Average interest rate as of March 31, 2025	4.65%
Debt, gross	$ 19.3	19.3
Senior Notes \| Senior Notes 4.500% Due 2029
Debt Instrument [Line Items]
Average interest rate as of March 31, 2025	4.50%
Debt, gross	$ 400.0	400.0
Senior Notes \| Senior Notes 5.900%
Debt Instrument [Line Items]
Average interest rate as of March 31, 2025	5.90%
Debt, gross	$ 400.0	$ 400.0

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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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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- Definition

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.

+ References

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