Accumulated Other Comprehensive Loss (Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 2,039.9
Ending balance	2,143.8
Amounts reclassified from accumulated other comprehensive loss, tax	(0.6)	$ (0.4)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(26.2)	(10.6)
Other comprehensive income (loss) before reclassifications	0.2	(4.0)
Amounts reclassified from accumulated other comprehensive income (net of tax)
Net current-period other comprehensive income	0.2	(4.0)
Ending balance	(26.0)	(14.6)
Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(191.5)	(167.3)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from accumulated other comprehensive income (net of tax)	1.8	1.1
Net current-period other comprehensive income	1.8	1.1
Ending balance	(189.7)	(166.2)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(217.7)	(177.9)
Other comprehensive income (loss) before reclassifications	0.2	(4.0)
Amounts reclassified from accumulated other comprehensive income (net of tax)	1.8	1.1
Net current-period other comprehensive income	2.0	(2.9)
Ending balance	$ (215.7)	$ (180.8)