Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pensions
Components of net annual benefit cost (income):
Service cost	$ 0.4	$ 0.9	$ 2.7	$ 3.5
Interest cost	7.5	6.2	22.0	18.4
Expected return on plan assets	(9.3)	(8.0)	(24.8)	(23.9)
Amortization of prior service cost (credit)	0.0	0.0	0.1	0.1
Recognized net actuarial and other (gain) loss	0.2	3.1	9.2	9.5
Recognized loss due to settlement	0.1	0.4	0.5	0.4
Net periodic benefit cost (income)	(1.1)	2.6	9.7	8.0
Other Benefits
Components of net annual benefit cost (income):
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.0	0.1	0.2	0.2
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost (credit)	0.0	0.0	0.0	0.0
Recognized net actuarial and other (gain) loss	(0.2)	(0.3)	(0.6)	(0.7)
Recognized loss due to settlement	0.0	0.0	0.0	0.0
Net periodic benefit cost (income)	$ (0.2)	$ (0.2)	$ (0.4)	$ (0.5)