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Fair Value Measurements (Detail) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value $ 509.4 $ 504.3
Senior Note Due 2025 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value 262.3 263.1
Senior Note Due 2028 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value $ 247.1 $ 241.2