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Revenue - Net Investments in Direct Financing Leases (Details)
$ in Millions
Jun. 30, 2021
vessel
Jun. 30, 2021
lease
Jun. 30, 2021
USD ($)
Dec. 31, 2020
lease
Jan. 07, 2020
vessel
Jan. 07, 2020
lease
Jan. 07, 2020
USD ($)
Lessor, Lease, Description [Line Items]              
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Remainder of Fiscal Year     $ 32.3        
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Two Years     64.0        
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Three Years     64.3        
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years     64.2        
Purchase Obligation And Deferred Hire Amounts             $ 260.4
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One     64.2        
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Four     $ 446.5        
LNG Carriers [Member]              
Lessor, Lease, Description [Line Items]              
Number Of Vessels 9 9          
LNG Carriers [Member] | Direct Financing Lease [Member]              
Lessor, Lease, Description [Line Items]              
Number Of Vessels | lease   3   3      
Awilco Lng Carrier              
Lessor, Lease, Description [Line Items]              
Number Of Vessels         2 2