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Defined contribution and defined benefit retirement- Schedule of Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]    
Fair value at beginning of the year $ 429.6  
Fair value at end of the year 462.9 $ 429.6
Significant Unobservable Inputs (Level 3)    
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]    
Fair value at beginning of the year 264.8 320.5
Gain (loss) on assets held at end of year 11.1 (31.0)
Gain (loss) on assets sold during the year 14.4 (3.6)
Assets purchased 1.7 13.8
Assets sold (9.3) (15.5)
Transfers in (out)   (0.1)
Currency exchange rate fluctuations 9.4 (19.3)
Fair value at end of the year $ 292.1 $ 264.8