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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Carrying Amount |  | $ 956.3 | $ 29.3
Accumulated Amortization |  | (40.8) | (22.6)
Net Carrying Amount |  | 915.5 | 6.7
Acquired product rights - Libtayo |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life (in years) | 13 years |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Carrying Amount |  | 946.3 | 0.0
Accumulated Amortization |  | (35.7) | 0.0
Net Carrying Amount |  | 910.6 | 0.0
Other intangibles |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross Carrying Amount |  | 10.0 | 29.3
Accumulated Amortization |  | (5.1) | (22.6)
Net Carrying Amount |  | $ 4.9 | $ 6.7
Other intangibles | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life (in years) | 5 years |  |
Other intangibles | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life (in years) | 8 years |  |

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