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Financing (Components Of Debt) (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total short-term borrowings $ 0.0 $ 399.6
Total long-term debt 250.3 0.0
Debt discounts and debt issuance costs 0.9 0.4
Three Year Term Loan Facility | Line of Credit    
Debt Instrument [Line Items]    
Total long-term debt 250.3 0.0
Line of Credit | 364-Day Credit Agreementa    
Debt Instrument [Line Items]    
Total short-term borrowings $ 0.0 $ 399.6