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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 4.1 $ 3.0 $ 8.1 $ 6.1
Amortization of net prior service credit 0.0 0.0 0.1 0.1
Amortization of net actuarial gain (1.3) (1.9) (2.7) (3.8)
Net periodic (income) cost (0.7) (0.5) (1.3) (1.0)
Other employee benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 0.2 0.2 0.4 0.3
Amortization of net prior service credit (0.1) (0.1) (0.2) (0.2)
Amortization of net actuarial gain 0.0 0.1 0.0 0.1
Net periodic (income) cost $ 0.1 $ 0.0 $ 0.2 $ 0.0