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Summary of Significant Accounting Policies and Implementation of New Financial Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 11, 2019 | Jan. 01, 2019 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Advertising expense | $ 1,100.0 | $ 1,100.0 | $ 900.0 |  |  |
Advertising expense, percentage of revenue | 5.00% | 5.00% | 5.00% |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 530.0 |
Contract liabilities | $ 276.8 | $ 264.6 |  |  |  |
Operating lease, liability | $ 663.7 |  |  |  | $ 595.0 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent |  |  | us-gaap:OtherLiabilitiesNoncurrent |
Stockholders' equity | $ 5,825.2 | $ 2,699.1 |  |  |  |
Deferred tax assets | 730.5 | 385.1 |  |  |  |
Retained Earnings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity | 7,830.2 | 4,920.4 | $ 11,395.9 |  |  | $ 13,894.1
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity | $ (6,496.4) | $ (6,523.6) | (5,729.2) |  |  | (5,718.6)
Tax Cuts and Jobs Act, reclassification from AOCI to retained earnings, tax effect |  |  | $ 105.2 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | 763.8
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | (105.2)
Discontinued Operations, Disposed of by Sale | Elanco | Eli Lilly and Company |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Disposition of ownership interest |  |  |  | 80.20% |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Contract liabilities |  |  |  |  | $ (65.0) |
Accounting Standards Update 2014-09 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | 5.0
Accounting Standards Update 2016-16 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 2,500.0
Deferred tax liabilities |  |  |  |  |  | 1,800.0
Accounting Standards Update 2016-16 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | $ 700.0

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