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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

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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