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Business Segments, Geographic Information, and Major Customers - Geographic Summary (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 9,988.6	$ 10,429.5	$ 10,150.8	$ 9,181.3	$ 8,872.0	$ 8,543.0	$ 8,086.2	$ 8,194.3	$ 39,750.3	$ 33,695.5	$ 27,015.8
Property and equipment, net	350.3				329.8				350.3	329.8
United States
Revenue:
Revenue									20,555.5	17,938.0	14,368.8
Property and equipment, net	175.1				152.6				175.1	152.6
EMEA
Revenue:
Revenue									9,721.9	7,553.3	6,018.6
Property and equipment, net	124.5				120.2				124.5	120.2
Asia Pacific
Revenue:
Revenue									5,537.2	4,923.0	4,271.1
Property and equipment, net	7.5				10.4				7.5	10.4
Americas, excluding United States
Revenue:
Revenue									3,935.6	3,281.2	2,357.2
Property and equipment, net	$ 43.1				$ 46.7				43.1	46.7
U.K.
Revenue:
Revenue									6,300.0	5,000.0	4,100.0
Singapore
Revenue:
Revenue									$ 5,400.0	$ 4,800.0	$ 4,200.0

X

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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