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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Jan. 01, 2023	Mar. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Goodwill [Line Items]
Gross goodwill		$ 2,157.9	$ 2,157.9	$ 3,037.0
Less: Accumulated impairment charges		(543.1)	(543.1)	(881.9)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,155.1		2,155.1
Reallocation adjustments			0.0
Impairment of goodwill			(543.1)		$ 0.0
Foreign currency translation			2.8
Goodwill, ending balance		1,614.8	1,614.8	2,155.1
Public Cloud
Goodwill [Line Items]
Gross goodwill		595.8	595.8	0.0
Less: Accumulated impairment charges		0.0	0.0	0.0
Goodwill [Roll Forward]
Goodwill, beginning balance	0.0		0.0
Reallocation adjustments			594.7
Impairment of goodwill			0.0
Foreign currency translation			1.1
Goodwill, ending balance		595.8	595.8	0.0
Private Cloud
Goodwill [Line Items]
Gross goodwill		1,562.1	1,562.1	0.0
Less: Accumulated impairment charges		(543.1)	(543.1)	0.0
Goodwill [Roll Forward]
Goodwill, beginning balance	0.0		0.0
Reallocation adjustments			1,560.4
Impairment of goodwill	(270.8)	(272.3)	(543.1)
Foreign currency translation			1.7
Goodwill, ending balance		1,019.0	1,019.0	0.0
Multicloud Services
Goodwill [Line Items]
Gross goodwill		0.0	0.0	2,656.6
Less: Accumulated impairment charges		0.0	0.0	(700.2)
Goodwill [Roll Forward]
Goodwill, beginning balance	1,956.4		1,956.4
Reallocation adjustments			(1,956.4)
Impairment of goodwill			0.0
Foreign currency translation			0.0
Goodwill, ending balance		0.0	0.0	1,956.4
Apps & Cross Platform
Goodwill [Line Items]
Gross goodwill		0.0	0.0	328.0
Less: Accumulated impairment charges		0.0	0.0	(129.3)
Goodwill [Roll Forward]
Goodwill, beginning balance	198.7		198.7
Reallocation adjustments			(198.7)
Impairment of goodwill			0.0	(129.3)
Foreign currency translation			0.0
Goodwill, ending balance		0.0	0.0	198.7
OpenStack Public Cloud
Goodwill [Line Items]
Gross goodwill		0.0	0.0	52.4
Less: Accumulated impairment charges		0.0	0.0	(52.4)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 0.0		0.0
Reallocation adjustments			0.0
Impairment of goodwill			0.0
Foreign currency translation			0.0
Goodwill, ending balance		$ 0.0	$ 0.0	$ 0.0