Agreements and Transactions with Baxter (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Agreements and Transactions by Party [Line Items]
Total revenues	$ 3,871.7	$ 3,697.6	$ 11,556.9	$ 11,015.7
Selling, general and administrative	836.8	859.7	2,549.3	2,647.7
Manufacturing and Supply Agreement with Baxter
Agreements and Transactions by Party [Line Items]
Selling, general and administrative	0.3	9.8	10.2	43.5
Product sales
Agreements and Transactions by Party [Line Items]
Total revenues	3,752.8	3,533.8	11,198.5	10,537.9
Product sales \| Manufacturing and Supply Agreement with Baxter
Agreements and Transactions by Party [Line Items]
Total revenues	$ 57.6	$ 35.8	$ 142.6	$ 106.5

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration