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Discontinued Operations, Goodwill and Intangible Assets - Sale of businesses (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 28, 2022	Mar. 31, 2021	Sep. 30, 2021	Mar. 31, 2022
Disposal by Sale | Power construction business
Summary of financial information of the Disposal Group
Pre-tax gain (loss) on sale			$ 17.3
Disposal by Sale | Civil infrastructure construction business
Summary of financial information of the Disposal Group
Losses on remeasurement to fair value less cost to sell, net of tax		$ 32.8
Held for sale | Civil infrastructure construction business
Summary of financial information of the Disposal Group
Contingent consideration, prior work claims				$ 43.9
Held for sale | Oil and gas construction business
Summary of financial information of the Disposal Group
Pre-tax gain (loss) on sale	$ 3.0

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