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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Total debt | $ 1,835.7 | $ 1,638.7
Recorded Amount |  |
Derivative [Line Items] |  |
Variable rate debt | 1,030.7 | 843.8
Fixed rate debt | 819.3 | 819.3
Total debt | 1,850.0 | 1,663.1
Fair Value |  |
Derivative [Line Items] |  |
Variable rate debt | 1,030.7 | 843.8
Fixed rate debt | 823.8 | 814.3
Total debt | $ 1,854.5 | $ 1,658.1

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