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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for credit losses on Accounts receivable and retention	$ 3.3	$ 0.6
Allowance for credit losses on Other receivables	$ 3.9	$ 1.6
Common stock authorized (shares)	150,000,000.0	150,000,000.0
Common stock outstanding (shares)	72,400,000	72,300,000

X

- Definition

Account Receivable and Contract Receivable Retainage, Allowance for credit Loss

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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