Changes in Accumulated Other Comprehensive Loss (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 964.0	$ 964.0
Ending balance	989.8	1,070.7
Tax detriment	1.5	1.1
Pension and Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3.8	3.8
Other comprehensive loss before reclassifications		(1.2)
Amounts reclassified from accumulated other comprehensive loss		(2.7)
Net period other comprehensive (loss) income		(3.9)
Ending balance		(0.1)
Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(122.4)	(122.4)
Other comprehensive loss before reclassifications		6.9
Amounts reclassified from accumulated other comprehensive loss		0.0
Net period other comprehensive (loss) income		6.9
Ending balance		(115.5)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(118.6)	(118.6)
Other comprehensive loss before reclassifications		5.7
Amounts reclassified from accumulated other comprehensive loss		(2.7)
Net period other comprehensive (loss) income		3.0
Ending balance	$ (154.8)	$ (115.6)