Pension and Postretirement Benefits (Components of Net Periodic Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.2	0.2	0.5	0.6
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost	(0.3)	(0.3)	(0.7)	(0.8)
Amortization of net loss (gain)	(0.2)	(0.2)	(0.6)	(0.5)
Net periodic (benefit) expense	(0.3)	(0.3)	(0.8)	(0.7)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Amortization of Gain (Loss)	0.2	0.2	0.6	0.5
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.5	1.6	1.4
Interest cost	0.5	0.5	1.5	1.6
Expected return on plan assets	(0.8)	(0.8)	(2.4)	(2.4)
Amortization of prior service cost	(0.2)	(0.1)	(0.6)	(0.5)
Amortization of net loss (gain)	0.1	0.0	0.2	0.0
Net periodic (benefit) expense	(1.3)	0.1	(1.1)	0.1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Amortization of Gain (Loss)	(0.1)	$ 0.0	(0.2)	$ 0.0
Other	$ 1.4		$ 1.4