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Employee Benefits - Postretirement Amounts Included in Accumulated Other Comprehensive Income (Detail) - Other Postretirement Plan - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net Actuarial (Gain) Loss $ (5.6) $ (5.3)
Prior Service (Credit) Cost (10.6) (11.5)
Gross Amount in Accumulated Other Comprehensive Income (16.2) (16.8)
Income Tax Effect (4.1) (4.2)
Net Amount in Accumulated Other Comprehensive Income $ (12.1) $ (12.6)