Business Segment Information - Selected Financial Data for the Company's Business Segment Information (Details) - USD ($) $ in Millions		1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
		Sep. 30, 2021	Sep. 07, 2021	Sep. 30, 2022	Sep. 07, 2021	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenue		$ 111.4	$ 314.6	$ 462.1	$ 1,138.7	$ 1,337.4
Operating (loss) income		(1.4)	(35.3)	(36.7)	27.7	(84.1)
Expenditures for long-lived assets	[1]	1,657.4	96.0	141.1	215.7	407.1
Depreciation and amortization		30.2	52.1	131.5	194.9	381.1
Total assets				4,313.6		4,313.6	$ 4,198.8
Operating Segments | Network [Member]
Segment Reporting Information [Line Items]
Revenue		61.7	180.4	251.1	664.2	741.6
Operating (loss) income		(2.3)	18.9	(27.2)	78.3	(49.2)
Expenditures for long-lived assets	[1]	33.4	92.0	131.7	199.8	384.3
Depreciation and amortization		24.3	44.5	104.7	166.9	301.5
Total assets				3,153.7		3,153.7	2,949.2
Operating Segments | IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue		52.0	138.7	217.8	492.4	615.6
Operating (loss) income		1.7	9.0	(0.7)	25.2	(10.7)
Expenditures for long-lived assets	[1]	3.3	4.0	9.3	15.9	22.7
Depreciation and amortization		5.8	7.6	26.8	27.9	79.4
Total assets				800.6		800.6	842.0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		(2.3)	(4.5)	(6.8)	(17.9)	(19.8)
Intersegment Eliminations [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenue		2.3	4.5	6.8	17.9	19.8
Intersegment Eliminations [Member] | Network [Member]
Segment Reporting Information [Line Items]
Revenue		1.6	3.4	4.8	13.1	14.5
Intersegment Eliminations [Member] | IT Services and Hardware [Member]
Segment Reporting Information [Line Items]
Revenue		0.7	1.1	2.0	4.8	5.3
Corporate [Member]
Segment Reporting Information [Line Items]
Operating (loss) income		(0.8)	(63.2)	(8.8)	(75.8)	(24.2)
Expenditures for long-lived assets	[1]	1,620.7	0.0	0.1	0.0	0.1
Depreciation and amortization		$ 0.1	$ 0.0	0.0	$ 0.1	0.2
Corporate and Elimination [Member]
Segment Reporting Information [Line Items]
Total assets				$ 359.3		$ 359.3	$ 407.6

[1] Includes cost of acquisitions