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Financing (Components Of Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total short-term borrowings $ 263.5 $ 210.0
Other deferred financing costs associated with credit facilities (4.4) (4.9)
Total long-term debt 541.1 540.6
Debt discounts and debt issuance costs $ 8.9 9.4
6.55% notes due November 2036    
Debt Instrument [Line Items]    
Debt instrument, interest rate 6.55%  
Long-term debt $ 198.7 198.7
4.20% notes due March 2048    
Debt Instrument [Line Items]    
Debt instrument, interest rate 4.20%  
Long-term debt $ 346.8 346.8
Revolving Facility | Credit Agreement | Line of Credit    
Debt Instrument [Line Items]    
Total short-term borrowings $ 263.5 $ 210.0