Goodwill and Other Intangible Assets - Components of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	$ 10,091.1	$ 9,846.3
Accumulated amortization	(2,344.1)	(1,696.3)
Gross carrying amount	606.4	635.4
Total identifiable intangible assets	8,353.4	8,785.4
Technology [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	3,669.8	3,599.4
Accumulated amortization	(1,061.4)	(806.8)
Total identifiable intangible assets	2,608.4	2,792.6
Intellectual Property Rights [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	180.7	181.6
Accumulated amortization	(176.1)	(172.3)
Total identifiable intangible assets	4.6	9.3
Trademarks and Trade Names [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	671.1	626.1
Accumulated amortization	(132.1)	(80.8)
Gross carrying amount	460.0	475.1
Total identifiable intangible assets	999.0	1,020.4
Customer Relationships [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	5,409.5	5,303.5
Accumulated amortization	(890.4)	(566.0)
Total identifiable intangible assets	4,519.1	4,737.5
In Process Research and Development (IPR&D) [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	146.4	160.3
Total identifiable intangible assets	146.4	160.3
Other [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	160.0	135.7
Accumulated amortization	(84.1)	(70.4)
Total identifiable intangible assets	$ 75.9	$ 65.3