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Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 10.1 $ 11.2
Stock options and restricted share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 8.2 8.0
Deferred share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 1.9 $ 3.2