Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 6.8		$ 7.5	$ 20.9	$ 22.6
Interest cost	10.7		7.9	29.9	23.5
Expected return on assets	(22.6)		(25.2)	(68.3)	(76.3)
Amortization of prior service credit	0.0		0.0	0.0	0.0
Recognized actuarial loss	5.6		5.5	14.9	16.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	3.0	$ 6.3	2.9	9.3	9.5
Total Net Periodic Benefits Cost	3.5		(1.4)	6.7	(4.4)
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1.6		1.5	4.8	4.5
Interest cost	3.0		2.5	9.0	7.5
Expected return on assets	(4.0)		(3.8)	(12.0)	(11.4)
Amortization of prior service credit	(0.6)		(0.6)	(1.8)	(1.8)
Recognized actuarial loss	0.7		1.2	2.1	3.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0.0		0.0	0.0	0.0
Total Net Periodic Benefits Cost	$ 0.7		$ 0.8	$ 2.1	$ 2.4