Pension And Other Postretirement Benefits Benefit Obligation (Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	$ 722.0
Balance, end of year	680.7	$ 722.0
Paid from Company assets for unfunded nonqualified benefits	1.6	1.8
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period	921.8	825.1
Service cost	30.2	29.2	$ 25.6
Interest cost	23.9	26.7	30.0
Actuarial loss (gain)	(11.6)	134.7
Benefits paid from plan assets	(2.5)	(2.1)
Benefits paid from Company assets	(1.6)	(1.8)
Plan participants' contributions
Administrative expenses paid	(1.5)	(3.2)
Settlements	(116.8)	(86.8)
Benefit obligation, end of period	841.9	921.8	825.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	722.0	658.4
Actual return on plan assets	39.5	115.7
Employer contributions	41.6	41.8
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant
Benefits paid	(4.1)	(3.9)
Administrative expenses paid	(1.5)	(3.2)
Settlements	(116.8)	(86.8)
Balance, end of year	680.7	722.0	658.4
Unfunded status	161.2	199.8
Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period	80.9	76.2
Service cost	2.2	2.1	2.0
Interest cost	1.7	2.4	2.9
Actuarial loss (gain)	(5.0)	4.9
Benefits paid from plan assets
Benefits paid from Company assets	(5.6)	(5.8)
Plan participants' contributions	0.9	1.1
Administrative expenses paid
Settlements
Benefit obligation, end of period	75.1	80.9	76.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year
Actual return on plan assets
Employer contributions	4.7	4.7
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0.9	1.1
Benefits paid	(5.6)	(5.8)
Administrative expenses paid
Settlements
Balance, end of year
Unfunded status	$ 75.1	$ 80.9