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Revenue - Schedule of Marine Segment Revenue (Details) - Marine Services
$ in Millions
Jun. 30, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 61.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 284.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 59.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 406.2
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 37.2
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 217.4
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 59.9
Telecommunication - Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 314.5
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 15.3
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0.0
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0.0
Telecommunication - Installation | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 15.3
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 5.9
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 18.9
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0.0
Power - Operations, Maintenance & Construction Support | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations 24.8
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 3.0
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 48.6
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Segment Reporting Information [Line Items]  
Remaining performance obligations 0.0
Power - Cable Installation & Repair | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Segment Reporting Information [Line Items]  
Remaining performance obligations $ 51.6