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Defined contribution and defined benefit retirement - Composition of Pension Plan Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 462.9 $ 429.6  
Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 111.7 114.9  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 19.5 14.8  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 292.1 264.8 $ 320.5
Assets measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 39.6 35.1  
Non U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 422.6 $ 390.5 $ 481.5
Long-term return on plan assets 4.60% 2.50% 2.40%
Germany      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 269.4 $ 234.0  
Germany | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 269.4 234.0  
Canada | Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets   0.1  
Canada | Non Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2.7 11.0  
Canada | Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 86.2 72.9  
Canada | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.1 0.6  
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets   0.1  
Canada | Quoted Prices in Active Markets (Level 1) | Non Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2.7 11.0  
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 86.2 72.9  
Canada | Quoted Prices in Active Markets (Level 1) | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.1 0.6  
Norway | Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2.4 2.3  
Norway | Non Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 7.2 4.7  
Norway | Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 23.9 21.8  
Norway | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 3.0 2.7  
Norway | Non Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.2 8.4  
Norway | Real Estate.      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 6.6 7.8  
Long-term return on plan assets 6.00%    
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 2.4 2.3  
Norway | Quoted Prices in Active Markets (Level 1) | Non Local Currency Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 7.2 4.7  
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.4 7.0  
Norway | Quoted Prices in Active Markets (Level 1) | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2.8 2.4  
Norway | Quoted Prices in Active Markets (Level 1) | Non Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 4.2 8.4  
Norway | Significant Other Observable Inputs (Level 2) | Local Currency Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 19.5 14.8  
Norway | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of plan asset allocation     14.00%
Norway | Significant Unobservable Inputs (Level 3) | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.2 0.3  
Norway | Significant Unobservable Inputs (Level 3) | Real Estate.      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 6.6 7.8  
Other.      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 15.9 24.2  
Other. | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets   1.5  
Other. | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 15.9 22.7  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 40.3 $ 39.1 $ 52.4
Long-term return on plan assets 5.00% 4.00% 4.00%
United States | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 1.9 $ 3.8  
United States | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 11.3 12.4  
United States | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 27.1 22.9  
United States | Quoted Prices in Active Markets (Level 1) | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 0.7 2.8  
United States | Quoted Prices in Active Markets (Level 1) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets   1.0  
United States | Quoted Prices in Active Markets (Level 1) | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets   0.2  
United States | Assets measured at NAV | Cash and Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1.2 1.0  
United States | Assets measured at NAV | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 11.3 11.4  
United States | Assets measured at NAV | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 27.1 $ 22.7