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Discontinued Operations, Goodwill and Intangible Assets - Sale of businesses (Details) - Held for sale - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 28, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Civil infrastructure construction business |  |  |  |
Discontinued Operations, Goodwill and Intangible Assets |  |  |  |
Loss on disposal of business |  |  | $ 38.9 | $ 40.0
Oil and gas construction business |  |  |  |
Discontinued Operations, Goodwill and Intangible Assets |  |  |  |
Consideration | $ 14.0 |  |  |
Pre-tax gain | $ 3.0 |  |  |
Amount of cash payment for contingent consideration collected |  | $ 9.2 |  |

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