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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (29.2)	$ (33.8)	$ (30.4)	$ (33.6)
Other Comprehensive Income (Loss) before reclassifications	0.9	(0.3)	2.0	(1.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.1	0.5	0.2	1.1
Net current-period other comprehensive income (loss)	1.0	0.2	2.2	0.0
Ending Balance	(28.2)	(33.6)	(28.2)	(33.6)
Interest Rate Risk
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net current-period other comprehensive income (loss)			(0.2)
Gains and Losses on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss) before reclassifications	1.0	(0.1)	1.8	(0.7)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.1	0.0	0.4
Net current-period other comprehensive income (loss)	1.0	0.0	1.8	(0.3)
AOCI Tax, Attributable to Parent	(2.2)	(7.6)	(2.2)	(7.6)	$ (3.2)	$ (4.0)	$ (7.6)	$ (7.3)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13.3)	(12.9)	(13.2)	(12.8)
Other Comprehensive Income (Loss) before reclassifications	0.0	(0.2)	0.0	(0.4)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.1)	0.1	(0.2)	0.2
Net current-period other comprehensive income (loss)	(0.1)	(0.1)		(0.2)
Ending Balance	(13.4)	(13.0)	(13.4)	(13.0)
Pension and OPEB Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss) before reclassifications	(0.1)	0.0	0.2	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.3	0.4	0.5
Net current-period other comprehensive income (loss)	0.1	0.3	0.6	0.5
AOCI Tax, Attributable to Parent	$ (12.6)	$ (13.0)	$ (12.6)	$ (13.0)	$ (12.7)	$ (13.2)	$ (13.3)	$ (13.5)