Dispositions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Business Acquisition [Line Items]
Contract estimated forward loss provision	$ 0.0
Network Rail
Business Acquisition [Line Items]
Contract estimated forward loss provision		$ 24.2
Percentage complete	51.00%
Deutsche Bahn
Business Acquisition [Line Items]
Contract estimated forward loss provision		7.4
Percentage complete	36.00%
SBB | Contract
Business Acquisition [Line Items]
Contract estimated forward loss provision		3.5
Percentage complete	85.00%
Discontinued Operations, Held-for-sale | Harsco Rail Segment
Business Acquisition [Line Items]
Corporate overhead expenses	$ 1.0	$ 1.0