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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Revenue	$ 4,702.1	$ 4,482.7	$ 3,158.3	$ 8,015.2	$ 9,358.1	$ 9,322.7	$ 9,459.4	$ 8,678.8	$ 20,358.3	$ 36,819.0	$ 39,750.3
Property and equipment, net:
Property and equipment, net	342.6				360.9				342.6	360.9
United States
Revenue:
Revenue									10,365.2	19,365.2	20,555.5
Property and equipment, net:
Property and equipment, net	177.6				173.0				177.6	173.0
EMEA
Revenue:
Revenue									4,961.0	9,235.1	9,721.9
Property and equipment, net:
Property and equipment, net	144.1				135.7				144.1	135.7
Asia Pacific
Revenue:
Revenue									3,035.6	4,581.1	5,537.2
Property and equipment, net:
Property and equipment, net	7.9				44.2				7.9	44.2
Americas, excluding United States
Revenue:
Revenue									1,996.6	3,637.6	3,935.6
Property and equipment, net:
Property and equipment, net	$ 13.1				$ 8.0				13.1	8.0
U.K.
Revenue:
Revenue									3,100.0	5,500.0	6,300.0
Singapore
Revenue:
Revenue									$ 3,000.0	$ 4,500.0	$ 5,400.0

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