Goodwill and Other Intangible Assets - Components of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	$ 9,996.1	$ 10,091.1
Accumulated amortization	(2,904.1)	(2,344.1)
Gross carrying amount	592.6	606.4
Total identifiable intangible assets	7,684.6	8,353.4
Technology [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	3,638.5	3,669.8
Accumulated amortization	(1,282.7)	(1,061.4)
Total identifiable intangible assets	2,355.8	2,608.4
Intellectual Property Rights [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	180.7	180.7
Accumulated amortization	(177.6)	(176.1)
Total identifiable intangible assets	3.1	4.6
Trademarks and Trade Names [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	664.2	671.1
Accumulated amortization	(169.3)	(132.1)
Gross carrying amount	457.1	460.0
Total identifiable intangible assets	952.0	999.0
Customer Relationships [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	5,384.4	5,409.5
Accumulated amortization	(1,194.5)	(890.4)
Total identifiable intangible assets	4,189.9	4,519.1
In Process Research and Development (IPR&D) [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	135.5	146.4
Total identifiable intangible assets	135.5	146.4
Other [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	128.3	160.0
Accumulated amortization	(80.0)	(84.1)
Total identifiable intangible assets	$ 48.3	$ 75.9