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Revenue and Contract Balances - Schedule of Contract Balances (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Revenue from Contract with Customer [Abstract] |  |  |
Accounts receivable | $ 37.4 |  | $ 43.4
Contracts retention | 8.4 |  | 8.6
Allowance for credit losses on accounts receivable and retention | (1.5) | $ (0.3) | (0.4)
Accounts receivable and retention, net | 44.3 |  | 51.6
Costs and estimated earnings in excess of billings on uncompleted contracts | 9.3 |  | 10.0
Billings in excess of costs and estimated earnings on uncompleted contracts | 7.6 |  | 7.9
Variable consideration | 62.0 |  | 62.0
Other long term deferred revenue | $ 5.4 |  | $ 5.6

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