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Pension and Non-pension Post-employment Benefit Plans - Plan Balances Reported on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations $ (107.5) $ (117.3)
Current other post-employment benefit obligations (0.3) (0.7)
Non-current net defined benefit asset (note 9) 5.1 5.6
Excess (deficiency) of plan assets over accrued benefit obligations (102.7) (112.4)
Pension Plan    
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations (20.7) (24.4)
Current other post-employment benefit obligations 0.0 0.0
Non-current net defined benefit asset (note 9) 5.1 5.6
Excess (deficiency) of plan assets over accrued benefit obligations (15.6) (18.8)
Other benefit plans    
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations (86.8) (92.9)
Current other post-employment benefit obligations (0.3) (0.7)
Non-current net defined benefit asset (note 9) 0.0 0.0
Excess (deficiency) of plan assets over accrued benefit obligations $ (87.1) $ (93.6)