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
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 4.0	$ 3.1
Net periodic (income) cost	(0.6)	(0.5)
Other employee benefit plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.2	0.1
Amortization of net prior service credit and net actuarial gain	(0.1)	(0.1)
Net periodic (income) cost	$ 0.1	$ 0.0