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Related Party Transactions - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 08, 2019 | Sep. 30, 2018 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 08, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jan. 01, 2018 Subsidiaries
Teekay Offshore [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue from Related Parties |  |  |  |  | $ 7.6 |  |  |
Teekay Offshore [Member] | Brookfield Business Partners L.P. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership acquired |  |  |  |  |  |  |  | 100.00%
Number of Subsidiaries | Subsidiaries |  |  |  |  |  |  |  | 7
Technical Services [Member] | Teekay Offshore [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  | 9.6 |  |  |
Time-Charter Hire Expense [Member] | Teekay Lng Marubeni Joint Venture [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Additional Time Period For Fixed Rate Time Charters Contract |  | 2 years |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  | $ 6.0 | $ 5.3 |  | $ 17.3 | $ 14.0 |
Time-Charter Hire Expense [Member] | Teekay Offshore [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  | $ 20.8 |  |  |
LNG Carriers [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue from Related Parties |  |  | $ 21.1 | $ 17.4 |  | $ 58.5 | $ 50.0 |
Teekay Lng Marubeni Joint Venture [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 52.00% |  |  | 52.00% |  |
General Partner [Member] | Teekay Offshore [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest | 49.00% |  |  |  |  |  |  |

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