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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, 2021
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
Loss from sale of business	$ 3.0
Consideration	$ 14.0
Amount of cash payment for contingent consideration collected		$ 9.2

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