Revenue - Narrative (Details) - Infrastructure $ in Millions	Jun. 30, 2021 USD ($)
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	$ 35.6
Change in contract assets costs in excess of billings, transfer to receivables	29.4
Change in contract liabilities costs in excess of billings, new commercial contracts	114.4
Change in contract liabilities costs in excess of billings, transfer to receivables	74.8
Remaining commitment obligations, amount	10.0
Banker Steel Acquisition
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	1.9
Change in contract liabilities costs in excess of billings, new commercial contracts	$ 55.0