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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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

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