Financing (Components Of Debt) (Details) - USD ($) $ in Millions			12 Months Ended
	Jul. 28, 2021	Apr. 16, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2014	Nov. 30, 2006
Debt Instrument [Line Items]
Short-term borrowings			$ 0.0	$ 375.7
Long-term debt			(842.4)	(842.9)
Debt discounts and debt issuance costs			5.7	6.6
4.45% notes due December 2023
Debt Instrument [Line Items]
Long-term debt			$ (299.4)	$ (299.1)
Debt instrument interest rate			4.45%	4.45%	4.45%
6.55% notes due November 2036
Debt Instrument [Line Items]
Long-term debt			$ (198.5)	$ (198.4)
Debt instrument interest rate			6.55%	6.55%		6.55%
4.20% notes due March 2048
Debt Instrument [Line Items]
Long-term debt			$ (346.3)	$ (346.2)
Debt instrument interest rate			4.20%	4.20%
Other deferred financing costs associated with credit facilities
Debt Instrument [Line Items]
Long-term debt			$ (1.8)	$ (0.8)
Commercial paper
Debt Instrument [Line Items]
Short-term borrowings			0.0	27.2
Debt instrument, term	397 days
Line of Credit | 364-Day Credit Agreement
Debt Instrument [Line Items]
Short-term borrowings			$ 0.0	$ 348.5
Notes Payable to Banks
Debt Instrument [Line Items]
Debt instrument, term		364 days	364 days	364 days