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Pension and Non-pension Post-employment Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]        
Percentage of plan members that are active employees of the Company   1.00%    
Loss on pension annuity purchases (see note 18(a)) $ 0.2 $ 0.0 $ 0.2 $ 0.0
Plan assets, at fair value   $ 361.9 380.1  
Percentage of plan assets held with financial institutions with a rating of A- or above   96.00%    
Number of basis points   1.00%    
Pension Plan        
Disclosure of defined benefit plans [line items]        
Plan assets, at fair value   $ 359.9 378.1  
Plan assets, decrease due to restrictions   (1.6) 0.0  
Level 1        
Disclosure of defined benefit plans [line items]        
Plan assets, at fair value   33.2 31.8  
Level 3        
Disclosure of defined benefit plans [line items]        
Plan assets, at fair value   $ 328.7 $ 348.3