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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Total debt | $ 1,638.7 | $ 1,988.3
Carrying (Reported) Amount, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 843.8 | 1,187.5
Fixed rate debt | 819.3 | 819.3
Total debt | 1,663.1 | 2,006.8
Estimate of Fair Value, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 843.8 | 1,187.5
Fixed rate debt | 814.3 | 824.5
Total debt | $ 1,658.1 | $ 2,012.0

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