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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, 2025
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,064.9 $ 1,064.9
Ending balance   1,214.1
Tax detriment 1.3 1.1
Pension and Postretirement Benefits    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.7 0.7
Other comprehensive gain before reclassifications   0.0
Amounts reclassified from accumulated other comprehensive loss   (0.8)
Net period other comprehensive (loss) income   (0.8)
Ending balance   (0.1)
Currency Translation Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (173.3) (173.3)
Other comprehensive gain before reclassifications   75.8
Amounts reclassified from accumulated other comprehensive loss   0.0
Net period other comprehensive (loss) income   75.8
Ending balance   (97.5)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (172.6) (172.6)
Other comprehensive gain before reclassifications   75.8
Amounts reclassified from accumulated other comprehensive loss   (0.8)
Net period other comprehensive (loss) income   75.0
Ending balance   $ (97.6)