Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total accounts receivables with customers	$ 312.0	$ 290.7
Construction
Segment Reporting Information [Line Items]
Total accounts receivables with customers	208.4	199.2
Energy
Segment Reporting Information [Line Items]
Total accounts receivables with customers	22.4	31.1
Telecommunications
Segment Reporting Information [Line Items]
Total accounts receivables with customers	74.1	51.9
Broadcasting
Segment Reporting Information [Line Items]
Total accounts receivables with customers	$ 7.1	$ 8.5