Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Mar. 11, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain related to disposition			$ 0.0	$ 0.0	$ 3,680.5
Revenues			28,318.4	24,539.8	22,319.5
Net income			$ 0.0	$ 0.0	3,680.5
Discontinued Operations, Disposed of by Sale | Elanco
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain related to disposition		$ 3,700.0
Revenues					580.0
Net income					$ 3,680.0
Transitional services agreement, term	24 months
Eli Lilly and Company | Discontinued Operations, Disposed of by Sale | Elanco
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition of ownership interest	80.20%