Goodwill and Other Intangible Assets - Components of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	$ 10,704.4	$ 10,212.6
Accumulated amortization	(4,141.1)	(3,471.8)
Gross carrying amount	492.2	516.8
Total identifiable intangible assets	7,055.5	7,257.6
Technology [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	3,902.0	3,634.0
Accumulated amortization	(1,746.2)	(1,487.6)
Total identifiable intangible assets	2,155.8	2,146.4
Intellectual Property Rights [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	383.3	378.3
Accumulated amortization	(211.6)	(191.9)
Total identifiable intangible assets	171.7	186.4
Trademarks and trade names [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	677.0	659.9
Accumulated amortization	(251.5)	(207.6)
Gross carrying amount	462.7	454.9
Total identifiable intangible assets	888.2	907.2
Customer relationships [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	5,589.7	5,375.0
Accumulated amortization	(1,820.9)	(1,489.4)
Total identifiable intangible assets	3,768.8	3,885.6
In Process Research and Development (IPR&D) [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	29.5	61.9
Total identifiable intangible assets	29.5	61.9
Other [Member]
Identifiable Intangible Assets Acquired [Line Items]
Gross carrying amount	152.4	165.4
Accumulated amortization	(110.9)	(95.3)
Total identifiable intangible assets	$ 41.5	$ 70.1