Shareholders' Equity (Schedule Of Accumulated Other Comprehensive Income Activity) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 591.8	$ 535.0
Ending Balance		757.1	591.8
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		1.0	0.5
Other comprehensive (loss) income before reclassifications, net of tax benefit (expense)		(3.2)	0.5
Amounts reclassified from accumulated other comprehensive (loss)		0.0	0.0
Net current period other comprehensive (loss)		(3.2)	0.5
Ending Balance		(2.2)	1.0
Derivative (Loss) Gain [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	0.5	9.5
Other comprehensive (loss) income before reclassifications, net of tax benefit (expense)	[1]	2.5	(0.4)
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(4.1)	(8.6)
Net current period other comprehensive (loss)	[1]	(1.6)	(9.0)
Ending Balance	[1]	(1.1)	0.5
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(106.2)	(110.1)
Other comprehensive (loss) income before reclassifications, net of tax benefit (expense)	[1]	2.1	4.5
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(2.8)	(0.6)
Net current period other comprehensive (loss)	[1]	(0.7)	3.9
Ending Balance	[1]	(106.9)	(106.2)
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(104.7)	(100.1)
Other comprehensive (loss) income before reclassifications, net of tax benefit (expense)	[1]	1.4	4.6
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(6.9)	(9.2)
Net current period other comprehensive (loss)	[1]	(5.5)	(4.6)
Ending Balance	[1]	$ (110.2)	$ (104.7)

[1] Amounts are net of tax and include our 50% share of AOCI components from our WAVE joint venture.