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Accounting Standards and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 368.4 | $ 314.9
Unbilled Revenues |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | 126.5 | 104.2
Retention Receivable | Unbilled Revenues |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 12.9 | $ 12.2

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