Shareholders' Equity (Schedule of Accumulated Other Comprehensive (Loss) Activity) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 591.8	$ 535.0
Ending Balance		626.8	544.8
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	1.0	0.5
Other comprehensive income before reclassifications, net of tax (expense)	[1]	(0.8)	(0.1)
Amounts reclassified from accumulated other comprehensive (loss)	[1]	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	[1]	(0.8)	(0.1)
Ending Balance	[1]	0.2	0.4
Derivative (Loss) Gain [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	0.5	9.5
Other comprehensive income before reclassifications, net of tax (expense)	[1]	2.2	(0.3)
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(1.7)	(1.9)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	[1]	0.5	(2.2)
Ending Balance	[1]	1.0	7.3
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(106.2)	(110.1)
Other comprehensive income before reclassifications, net of tax (expense)	[1]	0.0	0.4
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(0.6)	(0.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	[1]	(0.6)	0.2
Ending Balance	[1]	(106.8)	(109.9)
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(104.7)	(100.1)
Other comprehensive income before reclassifications, net of tax (expense)	[1]	1.4	0.0
Amounts reclassified from accumulated other comprehensive (loss)	[1]	(2.3)	(2.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	[1]	(0.9)	(2.1)
Ending Balance	[1]	$ (105.6)	$ (102.2)

[1] (1) Amounts are net of tax.