Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Components of net periodic benefit cost
Service costs	$ 1.3	$ 1.1	$ 2.5	$ 2.2
Interest costs	0.9	0.5	1.7	0.9
Expected return on plan assets	(2.5)	(3.3)	(5.0)	(6.5)
Recognized net actuarial loss	0.9	0.0	1.8	0.0
Net periodic benefit expense (income)	0.6	(1.7)	1.0	(3.4)
Postretirement Benefits
Components of net periodic benefit cost
Service costs	0.0	0.0	0.0	0.0
Interest costs	0.1	0.1	0.2	0.1
Expected return on plan assets	0.0	(0.1)	(0.1)	(0.2)
Recognized net actuarial loss	0.0	0.0	0.1	0.1
Net periodic benefit expense (income)	$ 0.1	$ 0.0	$ 0.2	$ 0.0