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Pension and Non-pension Post-employment Benefit Plans - Expense Recognized in Consolidated Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Disclosure of defined benefit plans [line items]      
Current service cost $ 2.2 $ 0.3 $ 2.5
Net interest cost 0.1 0.4 0.4
Past service cost and settlement/curtailment losses 0.0 0.0 0.0
Plan administrative expenses and other 0.5 0.6 1.3
Post-employment benefit expense, defined benefit plans 2.8 1.3 4.2
Defined contribution pension plan expense 12.7 12.3 11.6
Total expense for the year 15.5 13.6 15.8
Other benefit plans      
Disclosure of defined benefit plans [line items]      
Current service cost 3.1 3.1 3.4
Net interest cost 3.1 2.7 2.4
Past service cost and settlement/curtailment losses 0.9 0.0 0.3
Plan administrative expenses and other 0.0 0.0 0.0
Post-employment benefit expense, defined benefit plans 7.1 5.8 6.1
Defined contribution pension plan expense 0.0 0.0 0.0
Total expense for the year $ 7.1 $ 5.8 $ 6.1