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Other Post-Employment Benefit Plans - Components of Net Periodic Benefit Cost (Details) - Other Post-Employment Benefits and Other Employee Benefit Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of net periodic benefit cost:      
Interest cost $ 1.6 $ 0.7 $ 0.6
Amortization of net actuarial gain (0.1) (0.1) (0.2)
Amortization of net prior service credit (0.3) (0.3) (0.3)
Net periodic benefit cost 1.2 0.3 0.1
Impact of settlement/curtailment 0.0 0.0 0.0
Total benefit cost (income) $ 1.2 $ 0.3 $ 0.1