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Other matters (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 30, 2018 defendant | Jun. 30, 2019 defendant | Dec. 13, 2018 defendant | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
FCC reimbursements received |  |  |  | $ 3.0 |  |  |  |
Remaining FFC reimbursements expected to be received |  |  |  | 1.6 |  |  |  |
Settled litigation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of other broadcasters settling DOJ complaint (defendant) | defendant |  | 4 | 7 |  |  |  |  |
Equity And Debt Investment | Affiliated Entity |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Expenses incurred with related party |  |  |  | 18.5 | $ 13.7 | $ 42.4 | $ 24.2 |
Accounts payable and accrued liabilities with related party |  |  |  | $ 7.0 |  | $ 7.0 |  | $ 13.5
Clay, Massey & Associates, P.C. v. Gray Television |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of other broadcasters settling DOJ complaint (defendant) | defendant | 16 | 4 |  |  |  |  |  |

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