Segment Reporting - Reconciliation of Revenue and Gross Profits from Segments to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 29, 2024	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		$ 665.4	$ 690.8
Cost of revenue		(538.5)	(558.0)
Segment operating profit		38.4	652.8
Share-based compensation expense		(12.0)	(12.8)
Amortization of intangible assets		(37.4)	(38.7)
Impairment of goodwill		0.0	(573.2)
Impairment of assets, net		0.0	(20.0)
Interest expense		(19.4)	(43.7)
Gain (loss) on investments, net		(0.1)	0.1
Gain on debt extinguishment, net of debt modification costs		0.0	56.7
Other expense, net		(5.4)	(5.6)
Loss before income taxes		(63.3)	(645.3)
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		665.4	690.8
Segment operating profit		(78.3)	(79.3)
Corporate And Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment operating profit		(52.7)	(65.3)
Share-based compensation expense		(12.0)	(12.8)
Transaction-related adjustments, net		(1.5)	(1.0)
Restructuring and transformation expenses		(13.1)	(20.9)
Hosted Exchange incident expenses, net of proceeds received or expected to be received under our insurance coverage		0.0	(0.2)
Loss on contract termination			9.0
Public Cloud
Segment Reporting, Revenue Reconciling Item [Line Items]
Impairment of goodwill	$ (385.4)
Public Cloud | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		415.6	422.4
Cost of revenue		(326.4)	(334.1)
Other cost of revenue		(49.7)	(52.4)
Other segment items		(22.2)	(27.7)
Segment operating profit		(17.3)	(8.2)
Private Cloud
Segment Reporting, Revenue Reconciling Item [Line Items]
Impairment of goodwill	$ (187.8)
Private Cloud | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		249.8	268.4
Cost of revenue		(157.2)	(164.0)
Other segment items		(31.6)	(33.3)
Segment operating profit		$ (61.0)	$ (71.1)