Financing (Components Of Debt) (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term debt	$ 481.4	$ 149.4
Long-term debt	(842.7)	(842.0)
Debt discounts and debt issuance costs	6.4	6.7
4.45% notes due December 2023
Debt Instrument [Line Items]
Long-term debt	$ (299.1)	$ (298.9)
Debt instrument, interest rate	4.45%	4.45%
6.55% notes due November 2036
Debt Instrument [Line Items]
Long-term debt	$ (198.4)	$ (198.3)
Debt instrument, interest rate	6.55%	6.55%
4.20% notes due March 2048
Debt Instrument [Line Items]
Long-term debt	$ (346.2)	$ (346.1)
Debt instrument, interest rate	4.20%	4.20%
Other Deferred Financing Costs
Debt Instrument [Line Items]
Long-term debt	$ (1.0)	$ (1.3)
Commercial Paper
Debt Instrument [Line Items]
Short-term debt	135.3	149.4
Line of Credit \| 364-Day Credit Agreement
Debt Instrument [Line Items]
Short-term debt	$ 346.1	$ 0.0

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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