Dispositions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2022
Business Acquisition [Line Items]
Contract estimated forward loss provision			$ 33.4
Network Rail
Business Acquisition [Line Items]
Contract estimated forward loss provision	$ 0.3			$ 24.5
Percentage complete	48.00%			48.00%
Deutsche Bahn
Business Acquisition [Line Items]
Contract estimated forward loss provision		$ 7.4
Percentage complete	26.00%			26.00%
Contract 2 [Member] | SBB
Business Acquisition [Line Items]
Contract estimated forward loss provision		$ 3.5
Percentage complete	81.00%			81.00%