Pension and Postretirement Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.3	$ 4.1
Interest cost	4.0	3.2
Expected return on plan assets	(4.6)	(7.8)
Amortization of net actuarial losses	2.2	4.0
Amortization of prior service cost	0.1	0.5
Curtailment	0.0	(1.2)
Net periodic pension cost	5.0	2.8
Postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1
Interest cost	0.2	0.2
Amortization of prior service cost	0.1	0.0
Net periodic pension cost	$ 0.4	$ 0.3
ENPP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, minimum age to receive benefits	65 years