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Divestitures - Other Income (Details) - USD ($) $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 13, 2021 | Jul. 01, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |  |
Total Other Income |  |  | $ (1.2) | $ (0.3) | $ 139.3 | $ 15.3 | $ 16.2 | $ 1.2
Disposed of by sale |  |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |  |
Loss on inventory |  |  |  |  | (11.7) |  |  |
Other |  |  |  |  | (0.6) |  |  |
Myriad RBM, Inc. | Disposed of by sale |  |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary |  | $ 121.0 |  |  | 121.0 |  |  |
Myriad myPath LLC laboratory | Disposed of by sale |  |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary |  |  |  |  | 31.2 |  |  |
Myriad Autoimmune assets | Disposed of by sale |  |  |  |  |  |  |  |
Disposal of Subsidiary [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary | $ (0.6) |  |  |  | $ (0.6) |  |  |

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