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Note 4 - Accounts Receivable - Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Receivables $ 349.3 $ 304.4
Less allowance for doubtful accounts (15.1) (14.3)
Accounts receivable, net 334.2 290.1
Billed Revenues [Member]    
Receivables 317.1 273.7
Unbilled Revenues [Member]    
Receivables $ 32.2 $ 30.7