Discontinued Operations (Major Classes of Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets of discontinued operations	$ 0.0	$ 2,229.1
Noncurrent assets of discontinued operations	0.0	6,484.1
Current liabilities of discontinued operations	0.0	692.8
Noncurrent liabilities of discontinued operations	$ 0.0	2,742.3
Elanco | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories		1,013.7
Other current assets		1,215.4
Current assets of discontinued operations		2,229.1
Goodwill		2,980.9
Other intangibles, net		2,453.0
Property and equipment, net		923.4
Other assets		126.8
Noncurrent assets of discontinued operations		6,484.1
Current liabilities of discontinued operations		692.8
Long-term debt		2,443.3
Other liabilities		299.0
Noncurrent liabilities of discontinued operations		$ 2,742.3