Financing (Components Of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Apr. 04, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total short-term borrowings (a)	$ 6.6		$ 299.7
Other deferred financing costs associated with credit facilities	(3.6)		0.0
Total long-term debt	708.1		545.1
Debt discounts and debt issuance costs	$ 10.4		5.6
4.45% notes due December 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	4.45%	4.45%
Total short-term borrowings (a)	$ 0.0		299.7
6.55% notes due November 2036
Debt Instrument [Line Items]
Debt instrument, interest rate	6.55%
Long-term debt	$ 198.7		198.6
4.20% notes due March 2048
Debt Instrument [Line Items]
Debt instrument, interest rate	4.20%
Long-term debt	$ 346.6		346.5
Term Facility | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Long-term debt	166.4		0.0
Term Facility | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Total short-term borrowings (a)	$ 6.6		$ 0.0