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Fair Value Measurements (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value $ 503.6 $ 504.3
Senior Note Due 2025 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value 261.4 263.1
Senior Note Due 2028 [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term Debt, Fair Value $ 242.2 $ 241.2