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Revenue - Net Investments in Direct Financing Leases (Details) $ in Millions | Sep. 30, 2021 vessel | Sep. 30, 2021 lease | Sep. 30, 2021 USD ($) | Dec. 31, 2020 lease | Jan. 07, 2020 vessel | Jan. 07, 2020 lease | Jan. 07, 2020 USD ($)
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Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Remainder of Fiscal Year |  |  | $ 16.1 |  |  |  |
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 |

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- Definition Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919391-209981 + Details
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