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Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
May 28, 2021 | May 21, 2021 | May 01, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Divestitures [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  | $ 0.0 | $ 379.1
Loss on non-cancelable purchase commitment |  |  |  |  |  |  | 5.2
Loss on inventory |  |  |  |  |  | $ 0.0 | 6.5
Disposed of by sale | Myriad myPath LLC laboratory |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets | $ 32.5 |  |  |  |  |  |
Net gain on sale of assets adjusted for transaction fees |  |  |  |  | $ 31.2 |  |
(Loss) gain on divestiture |  |  |  | $ 0.0 |  |  | 31.2
Disposed of by sale | Myriad Autoimmune Assets |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business |  |  | $ 150.0 |  |  |  |
(Loss) gain on divestiture |  |  |  | (0.6) |  |  | (0.6)
Disposed of by sale | Myriad RBM, Inc. |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business |  | $ 197.0 |  |  |  |  |
(Loss) gain on divestiture |  |  |  | $ 121.0 |  |  | $ 121.0

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