Financing (Components Of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total short-term borrowings	$ 247.6	$ 210.0
Other deferred financing costs associated with credit facilities	(6.4)	(4.9)
Total long-term debt	834.3	540.6
Debt discounts and debt issuance costs	$ 11.8	9.4
6.55% notes due November 2036
Debt Instrument [Line Items]
Debt instrument, interest rate	6.55%
Long-term debt	$ 198.8	198.7
4.20% notes due March 2048
Debt Instrument [Line Items]
Debt instrument, interest rate	4.20%
Long-term debt	$ 346.9	346.8
Revolving Facility \| Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Total short-term borrowings	181.0	210.0
Term Loan \| Credit Agreement \| Delayed Draw Term Loan (DDTL)
Debt Instrument [Line Items]
Long-term debt	295.0	0.0
Term Loan \| Credit Agreement \| Delayed Draw Term Loan (DDTL)
Debt Instrument [Line Items]
Total short-term borrowings	$ 66.6	$ 0.0

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