Quarterly report pursuant to Section 13 or 15(d)

Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details)

v3.20.2
Operating Segments - Summarized Segment Financial Information (Parenthetical) (Details) - Forty-Vehicle Ferry
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Vechicle
Jun. 30, 2020
Vechicle
Jun. 30, 2019
USD ($)
Vechicle
Segment Reporting Information [Line Items]      
Revenue reclassified between the Shipyard and Fabrication & Services segments | $ $ 2.5   $ 3.3
Number of vehicle ferry projects | Vechicle 2 2 2