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Note 4 - Accounts Receivable - Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Receivables $ 467.6 $ 450.1
Less allowance for doubtful accounts (21.3) (17.7)
Accounts receivable, net 446.3 432.4
Billed Revenues [Member]    
Receivables 395.5 380.5
Unbilled Revenues [Member]    
Receivables $ 72.1 $ 69.6