Amount of Net Income (Loss) attributable to noncontrolling interest.

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Name:	us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Basis of Presentation (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 09, 2019
Other (income) and expense
Noncontrolling interest amounts, net of tax	$ 7.1	$ 6.2	$ 19.0	$ 17.9
Red Hat, Inc.
Percentage of business acquired (as a percent)					100.00%