Financing (Components Of Debt) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term debt	$ 0.0	$ 375.7
Long-term debt	842.2	842.9
Debt discounts and debt issuance costs	$ 5.8	$ 6.6
4.45% notes due December 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	4.45%	4.45%
Long-term debt	$ 299.3	$ 299.1
6.55% notes due November 2036
Debt Instrument [Line Items]
Debt instrument, interest rate	6.55%	6.55%
Long-term debt	$ 198.5	$ 198.4
4.20% notes due March 2048
Debt Instrument [Line Items]
Debt instrument, interest rate	4.20%	4.20%
Long-term debt	$ 346.3	$ 346.2
Other Deferred Financing Costs
Debt Instrument [Line Items]
Long-term debt	1.9	0.8
Commercial Paper
Debt Instrument [Line Items]
Short-term debt	0.0	27.2
Line of Credit \| 364-Day Credit Agreement
Debt Instrument [Line Items]
Short-term debt	$ 0.0	$ 348.5

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

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