Annual report pursuant to Section 13 and 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)

v3.23.1
Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Vechicle
Dec. 31, 2021
USD ($)
Vechicle
Hurricane Ida    
Long Term Contracts Or Programs Disclosure [Line Items]    
Date of landfall Aug. 29, 2021  
Impact of Hurricane Ida, description On August 29, 2021, Hurricane Ida made landfall near Houma, Louisiana as a high-end Category 4 hurricane, with high winds, heavy rains and storm surge causing significant damage and power outages throughout the region, including our Houma Facilities and operations. Our Houma Facilities did not experience significant flood damage; however, the high winds and heavy rain damaged multiple buildings and equipment and resulted in significant debris throughout the facility. Our insurance coverages in effect at the time of the storm generally specify coverage amounts for each of our buildings (including contents) and major equipment.  
Insurance payments received $ 13.1 $ 1.0
Gain on insurance recovery 7.5  
Gain on interruptions insurance recovery 3.7  
Charges associated with insurance recoveries of storm   3.2
Insurance receivables 1.1  
Hurricane Ida | Minimum    
Long Term Contracts Or Programs Disclosure [Line Items]    
Future repair costs associated with insurance payments received for buildings 0.5  
Hurricane Ida | Maximum    
Long Term Contracts Or Programs Disclosure [Line Items]    
Future repair costs associated with insurance payments received for buildings 1.0  
Marine Docking Structures, Offshore Modules and Material Supply Projects    
Long Term Contracts Or Programs Disclosure [Line Items]    
Change in estimated margins   3.3
Seventy-Vehicle Ferry    
Long Term Contracts Or Programs Disclosure [Line Items]    
Change in estimated margins $ 0.9 4.1
Projects, percent complete (percentage) 95.00%  
Reserve for loss $ 0.3  
Forty-Vehicle Ferry    
Long Term Contracts Or Programs Disclosure [Line Items]    
Change in estimated margins $ 1.1 $ 0.3
Projects, percent complete (percentage) 87.00%  
Reserve for loss $ 1.2  
Number of vehicle ferry projects with rework and construction challenges. | Vechicle 2  
Number of vehicle ferry projects | Vechicle   2
Remaining Forty-Vehicle Ferry | Hurricane Ida    
Long Term Contracts Or Programs Disclosure [Line Items]    
Total charges related to deductibles $ 0.2 $ 0.6
Offshore Modules, Material Supply and Subsea Structures Projects    
Long Term Contracts Or Programs Disclosure [Line Items]    
Change in estimated margins   3.3
Shipyard    
Long Term Contracts Or Programs Disclosure [Line Items]    
Reduction of estimated contract price for liquidated damages, amount 1.4 1.2
Change in estimated margins $ 2.0 $ 3.8