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Summary of Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses on accounts receivable and retention | $ 1.5 | $ 0.3 | $ 0.4
Allowance for credit losses on other receivables |  | 1.6 |
Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts |  | 0.0 |
As Reported under ASC 326 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses on accounts receivable and retention |  | 1.6 |
Allowance for credit losses on other receivables |  | 4.2 |
Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts |  | 0.1 |
ASU 2016-13 | Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses on accounts receivable and retention |  | 1.3 |
Allowance for credit losses on other receivables |  | 2.6 |
Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts |  | 0.1 |
Total |  | $ 4.0 |

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