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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, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations $ (77.0) $ (107.5)
Current other post-employment benefit obligations (0.1) (0.3)
Non-current net defined benefit asset (note 9) 7.1 5.1
Excess (deficiency) of plan assets over accrued benefit obligations (70.0) (102.7)
Pension Plan    
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations (13.1) (20.7)
Current other post-employment benefit obligations 0.0 0.0
Non-current net defined benefit asset (note 9) 7.1 5.1
Excess (deficiency) of plan assets over accrued benefit obligations (6.0) (15.6)
Other benefit plans    
Disclosure of defined benefit plans [line items]    
Pension and non-pension post-employment benefit obligations (63.9) (86.8)
Current other post-employment benefit obligations (0.1) (0.3)
Non-current net defined benefit asset (note 9) 0.0 0.0
Excess (deficiency) of plan assets over accrued benefit obligations $ (64.0) $ (87.1)