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Defined contribution and defined benefit retirement plans - Changes In Benefit Obligations Recognized In Accumulated Other Comprehensive Income (Loss) (Detail) - Defined benefit pension plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (losses) gains $ (25.0) $ 135.1 $ 52.5
Net actuarial losses 2.4 13.0 20.0
Prior service cost 0.1 0.1 0.2
Settlement loss 1.6 0.3  
Total $ (20.9) $ 148.5 $ 72.7