Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jul. 09, 2019
Provision for/(benefit from) income taxes	$ (1,226.0)	$ 289.0
Deferred tax asset from intra-entity sale	3,442.0
Net one-time benefit	$ 939.0
Percentage of business acquired (as a percent)	100.00%
Other (income) and expense
Noncontrolling interest amounts, net of tax	$ 4.5	$ 7.0
Red Hat, Inc.
Percentage of business acquired (as a percent)			100.00%