Revenue - Schedule of Revenues Disaggregation by Product and Service Lines (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2022	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 554.4	$ 1,138.7	$ 1,796.0	$ 1,559.8
Operating Segments [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	303.8	664.2	994.3	969.6
Operating Segments [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	259.3	492.4	827.9	616.6
Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	(8.7)	(17.9)	(26.2)	(26.4)
Intersegment Eliminations [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6.5	13.1	19.3	19.7
Intersegment Eliminations [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	2.2	4.8	6.9	6.7
Data [Member] | Operating Segments [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	156.2	334.6	523.3	479.4
Video [Member] | Operating Segments [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	60.4	131.8	193.6	193.8
Voice [Member] | Operating Segments [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	76.4	177.3	230.8	262.8
Other [Member] | Operating Segments [Member] | Network [Member]
Disaggregation Of Revenue [Line Items]
Revenues	10.8	20.5	46.6	33.6
Consulting [Member] | Operating Segments [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	105.5	193.6	339.4	196.0
Cloud [Member] | Operating Segments [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	31.9	66.4	101.7	86.2
Communications [Member] | Operating Segments [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	68.5	149.1	222.3	215.0
Infrastructure Solutions [Member] | Operating Segments [Member] | IT Services and Hardware [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 53.4	$ 83.3	$ 164.5	$ 119.4