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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill by Reportable Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,706.8
Just Analytics acquisition	5.9
Foreign currency translation	(4.1)
Goodwill, ending balance	2,708.6
Gross goodwill	3,056.0
Less: Accumulated impairment charges	(347.4)
Goodwill, net as of March 31, 2022	2,708.6
Multicloud Services
Goodwill [Roll Forward]
Goodwill, beginning balance	2,384.3
Just Analytics acquisition	0.0
Foreign currency translation	(4.0)
Goodwill, ending balance	2,380.3
Gross goodwill	2,675.3
Less: Accumulated impairment charges	(295.0)
Goodwill, net as of March 31, 2022	2,380.3
Apps & Cross Platform
Goodwill [Roll Forward]
Goodwill, beginning balance	322.5
Just Analytics acquisition	5.9
Foreign currency translation	(0.1)
Goodwill, ending balance	328.3
Gross goodwill	328.3
Less: Accumulated impairment charges	0.0
Goodwill, net as of March 31, 2022	328.3
OpenStack Public Cloud
Goodwill [Roll Forward]
Goodwill, beginning balance	0.0
Just Analytics acquisition	0.0
Foreign currency translation	0.0
Goodwill, ending balance	0.0
Gross goodwill	52.4
Less: Accumulated impairment charges	(52.4)
Goodwill, net as of March 31, 2022	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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