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Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Millions | Dec. 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 | $ 3.3 | $ 0.3 | $ 0.6
Allowance for credit losses on Other receivables |  | 1.6 |
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts |  | 0.0 |
Total |  | 1.9 |
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 |  | 4.3 |
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts |  | 0.1 |
Total |  | 6.0 |
Impact of adoption of new accounting standards | ASU 2016-13 |  |  |
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 |  | 2.7 |
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts |  | 0.1 |
Total |  | $ 4.1 |

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