Agreements and Transactions with Baxter (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Agreements and Transactions by Party [Line Items]
Selling, general and administrative	$ 859.7	$ 875.6	$ 2,647.7	$ 2,025.8
Prepaid expenses and other current assets related indemnification liabilities	95.6		95.6
Other non-current assets	33.6		33.6
Other current liabilities	60.4		60.4
Other non-current liabilities	59.6		59.6
Manufacturing and Supply Agreement with Baxter
Agreements and Transactions by Party [Line Items]
Revenue	35.8	31.0	106.5	47.0
Selling, general and administrative	$ 9.8	$ 24.0	$ 43.5	$ 32.0

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration