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Asset Impairment, Restructuring, and Other Special Charges (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment (gain) and other special charges | $ (20.0) | $ 497.8 | $ 139.1
Loxo Oncology, Inc. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment (gain) and other special charges |  | $ 400.7 |

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- Details
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