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Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 13, 2021 | Jul. 01, 2021 | May 28, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |
Loss on non-cancelable purchase commitment |  |  |  |  | $ 5.2 |  |
Loss on inventory |  |  |  | $ 0.0 | 6.5 | $ 0.0 | $ 0.0
Disposed of by sale | Myriad myPath LLC laboratory |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 32.5 |  |  |  |
Net gain on sale of assets adjusted for transaction fees |  |  | 31.2 |  |  |  |
Gain (loss) on sale of subsidiary |  |  |  |  | 31.2 |  |
Transaction costs |  |  | $ 1.3 |  |  |  |
Disposed of by sale | Myriad RBM, Inc. |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business |  | $ 197.0 |  |  |  |  |
Gain (loss) on sale of subsidiary |  | 121.0 |  |  | 121.0 |  |
Transaction costs |  | $ 4.8 |  |  |  |  |
Disposed of by sale | Select operating assets and intellectual property of Myriad Autoimmune business unit |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business | $ 150.0 |  |  |  |  |  |
Gain (loss) on sale of subsidiary | (0.6) |  |  |  | $ (0.6) |  |
Transaction costs | $ 4.4 |  |  |  |  |  |

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