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Acquisitions and Divestiture (Purchase Price Allocation) (Details) - USD ($) $ in Millions | Feb. 15, 2019 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 3,766.5 | $ 3,679.4
Loxo Oncology, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquired IPR&D | $ 4,670.0 |  |
Finite-lived intangibles | 980.0 |  |
Deferred income taxes | (1,032.8) |  |
Other assets and liabilities - net | (26.4) |  |
Total identifiable net assets | 4,590.8 |  |
Goodwill | 2,326.9 |  |
Total consideration transferred - net of cash acquired | $ 6,917.7 |  |
Contract-based intangibles | Loxo Oncology, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life | 12 years |  |
Selpercatinib (LOXO-292) | Loxo Oncology, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquired IPR&D | $ 4,600.0 |  |

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