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Acquisitions - Other Acquisitions (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 01, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
TAS Energy |  |  |  |
Acquisitions |  |  |  |
Total purchase price | $ 169.5 |  |  |
Purchase price allocated to goodwill and identifiable intangible assets | 126.2 |  |  |
Purchase price paid in cash | 105.9 |  |  |
Working capital adjustment | 40.5 |  |  |
Promissory note payable | 14.0 |  |  |
Contingent earn-out obligation | $ 9.1 |  |  |
T E C Industrial Construction and Maintenance |  |  |  |
Acquisitions |  |  |  |
Total purchase price |  |  | $ 88.9 |
Purchase price paid in cash |  |  | 73.0 |
Working capital adjustment |  |  | 1.3 |
Promissory note payable |  |  | 7.0 |
Estimated fair value of contingent earn-out payments |  |  | $ 7.6 |
Electrical Contractor North Carolina |  |  |  |
Acquisitions |  |  |  |
Total purchase price |  |  |  | $ 41.6
Mechanical Contractor Utah |  |  |  |
Acquisitions |  |  |  |
Total purchase price |  | $ 17.9 |  |

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