Related Party Agreements and Transactions - Amounts Due From/(Due To) Lilly (Details) - Lilly - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Total receivable from/(payable to) Lilly	$ 35.5	$ (268.7)
TSA
Related Party Transaction [Line Items]
Total receivable from/(payable to) Lilly	(30.2)	(28.0)
Other activities
Related Party Transaction [Line Items]
Total receivable from/(payable to) Lilly	94.2	(38.0)
Local country asset purchases
Related Party Transaction [Line Items]
Total receivable from/(payable to) Lilly	$ (28.5)	$ (202.7)

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant