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Financing (Components Of Debt) (Detail) - USD ($) $ in Millions	Aug. 11, 2022	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Short-term debt		$ 308.5	$ 699.3
Long-term debt		880.7	543.7
Debt discounts and debt issuance costs		$ 7.1	$ 5.6
4.45% Senior Notes Due 2023
Debt Instrument [Line Items]
Debt instrument, interest rate		4.45%	4.45%
Short-term debt		$ 299.8	$ 299.7
6.55% notes due November 2036
Debt Instrument [Line Items]
Debt instrument, interest rate		6.55%	6.55%
Long-term debt		$ 198.6	$ 198.6
4.20% notes due March 2048
Debt Instrument [Line Items]
Debt instrument, interest rate		4.20%	4.20%
Long-term debt		$ 346.5	$ 346.5
Other deferred financing costs associated with credit facilities
Debt Instrument [Line Items]
Long-term debt		3.7	1.4
Line of Credit \| Five Year Term Loan Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		339.3	0.0
Line of Credit \| Three Year Term Loan Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Short-term debt		8.7	0.0
Line of Credit \| 364-Day Credit Agreement
Debt Instrument [Line Items]
Short-term debt		$ 0.0	$ 399.6
Notes Payable to Banks \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, term (in days)	364 days