Revenue - Narrative (Details) - Construction $ in Millions	Mar. 31, 2020 USD ($)
Revenue from External Customer [Line Items]
Change in contract assets costs in excess of billings, new commercial contracts	$ 19.0
Change in contract assets costs in excess of billings, transfer to receivables	8.1
Change in contract liabilities costs in excess of billings, new commercial contracts	52.7
Change in contract liabilities costs in excess of billings, transfer to receivables	33.7
Remaining commitment obligations, amount	$ 19.9