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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

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