Financing (Components Of Debt) (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Short-term debt	$ 399.5	$ 0.0
Long-term debt	843.2	842.4
Debt discounts and debt issuance costs	$ 5.9	$ 5.7
4.45% notes due December 2023
Debt Instrument [Line Items]
Debt instrument, interest rate	4.45%	4.45%
Long-term debt	$ 299.6	$ 299.4
6.55% notes due November 2036
Debt Instrument [Line Items]
Debt instrument, interest rate	6.55%	6.55%
Long-term debt	$ 198.6	$ 198.5
4.20% notes due March 2048
Debt Instrument [Line Items]
Debt instrument, interest rate	4.20%	4.20%
Long-term debt	$ 346.5	$ 346.3
Other deferred financing costs associated with credit facilities
Debt Instrument [Line Items]
Long-term debt	1.5	$ 1.8
Line of Credit \| Three Hundred Sixty Four Day Credit Agreement
Debt Instrument [Line Items]
Short-term debt	$ 399.5

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

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