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Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Fair Value Disclosures [Abstract] |  |
Proceeds from sales | $ 43.3 | $ 38.0
Realized gross gains on sales | 1.1 | 0.9
Realized gross losses on sales | $ 0.4 | $ 0.8

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- Definition Available for Sale Securities and Equity Securities, FV-NI, Realized Gain + References No definition available. + Details
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- Definition Available for sale Securities and Equity Securities, FV-NI, Realized Loss + References No definition available. + Details
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- Definition Proceeds from Sale of Equity and Available for Sale Securities + References No definition available. + Details
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Namespace Prefix: | lly_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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