Pension and Postretirement Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive (Income) Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 367.0	$ 400.0
Prior service credit	(1.3)	(1.6)
Total recognized in accumulated other comprehensive loss	365.7	398.4
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(8.4)	(1.1)
Prior service credit	(2.0)	(3.1)
Total recognized in accumulated other comprehensive loss	$ (10.4)	$ (4.2)

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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-Publisher FASB
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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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