Defined Benefit and Postretirement Benefits (Components Of Net Periodic Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.4	$ 0.5	$ 0.9	$ 1.1
Interest cost	0.6	0.2	1.1	0.4
Expected return on plan assets	(0.8)	(0.7)	(1.6)	(1.5)
Amortization of prior service cost	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of net loss	0.0	0.2	0.0	0.4
Net periodic benefit	0.0	0.0	0.0	0.0
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.1
Interest cost	0.2	0.1	0.4	0.3
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost	(0.2)	(0.2)	(0.5)	(0.5)
Amortization of net loss	(0.2)	0.0	(0.3)	0.0
Net periodic benefit	$ (0.2)	$ (0.1)	$ (0.4)	$ (0.1)