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Pension - Schedule of Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure    
Defined benefit plan investment $ 266.7 $ 253.3
Mutual funds – U.S. equity    
Defined Benefit Plan Disclosure    
Defined benefit plan investment 34.4 32.6
Mutual funds – international equity    
Defined Benefit Plan Disclosure    
Defined benefit plan investment 22.8 22.3
Mutual funds - fixed income treasury and corporate bonds    
Defined Benefit Plan Disclosure    
Defined benefit plan investment 208.2 197.2
Cash equivalents    
Defined Benefit Plan Disclosure    
Defined benefit plan investment $ 1.3 $ 1.2