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Sale of Assets (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
May 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
vessel
Sep. 30, 2020
USD ($)
vessel
Dec. 31, 2019
vessel
Property, Plant and Equipment [Line Items]          
Operating Lease, Impairment Loss     $ 1.4 $ 2.1  
Ship To Ship Transfer Business [Member] | Ship To Ship Transfer Business [Member]          
Property, Plant and Equipment [Line Items]          
Gain (Loss) on sale of ship-to-ship transfer business       3.1  
Sale of ship-to-ship transfer business $ 12.7 $ 14.3   27.1  
Adjustment for final amounts of cash and other working capital on closing date       $ 1.1  
Suezmax Tankers [Member]          
Property, Plant and Equipment [Line Items]          
Number Of Vessels | vessel     3 3  
Number of Vessels Held for Sale | vessel         2
Gain (Loss) on Disposition of Assets       $ 2.6