Quarterly report pursuant to Section 13 or 15(d)

Equipment Acquisitions and Dispositions - Additional Information (Details)

v3.19.1
Equipment Acquisitions and Dispositions - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Vessel
Property Plant And Equipment [Line Items]  
Payments to acquire property, plant, and equipment, including fair value hedges $ 21.2
Proceeds from sale of property, plant, and equipment, excluding deposits for future vessel sales 0.1
Proceeds from deposits 4.3
Gain (loss) on disposition of property, plant and equipment 0.3
Increase (decrease) in contract with customer, liability $ 0.4
Fast Support Vessels  
Property Plant And Equipment [Line Items]  
Number of equipment acquired | Vessel 1
Platform Supply Vessel  
Property Plant And Equipment [Line Items]  
Number of equipment acquired | Vessel 1
Vessel Under Construction  
Property Plant And Equipment [Line Items]  
Number of equipment sold | Vessel 1
Standby Safety Vessels  
Property Plant And Equipment [Line Items]  
Number of equipment sold | Vessel 1