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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Disclosure of defined benefit plans [line items]      
Current service cost $ 2.5 $ 1.9 $ 1.9
Interest cost 0.4 0.5 0.6
Past service cost (credit) and settlement/curtailment losses 0.0 (0.8) 0.0
Plan administrative expenses and other 1.3 1.1 1.5
Post-employment benefit expense, defined benefit plans 4.2 2.7 4.0
Defined contribution pension plan expense 11.6 10.6 10.1
Total expense for the year 15.8 13.3 14.1
Other benefit plans      
Disclosure of defined benefit plans [line items]      
Current service cost 3.4 3.2 2.6
Interest cost 2.4 2.4 2.6
Past service cost (credit) and settlement/curtailment losses 0.3 2.3 8.0
Plan administrative expenses and other 0.0 0.0 0.0
Post-employment benefit expense, defined benefit plans 6.1 7.9 13.2
Defined contribution pension plan expense 0.0 0.0 0.0
Total expense for the year $ 6.1 $ 7.9 $ 13.2