Revenue - Schedule of Revenues Disaggregation by Contract Type (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
Disaggregation Of Revenue [Line Items]
Revenues	$ 111.4	$ 314.6	$ 462.1	$ 1,138.7	$ 1,337.4
Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	13.2	29.2	51.7	105.9	141.8
Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	98.2	285.4	410.4	1,032.8	1,195.6
Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	(2.3)	(4.5)	(6.8)	(17.9)	(19.8)
Intersegment Eliminations [Member] | Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0	0.0
Intersegment Eliminations [Member] | Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0	0.0
Network [Member] | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	61.7	180.4	251.1	664.2	741.6
Network [Member] | Operating Segments | Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	2.1	4.1	6.9	15.8	20.4
Network [Member] | Operating Segments | Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	58.0	172.9	239.4	635.3	706.7
Network [Member] | Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1.6	3.4	4.8	13.1	14.5
IT Services and Hardware [Member] | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	52.0	138.7	217.8	492.4	615.6
IT Services and Hardware [Member] | Operating Segments | Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	11.1	25.1	44.8	90.1	121.4
IT Services and Hardware [Member] | Operating Segments | Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenues	40.2	112.5	171.0	397.5	488.9
IT Services and Hardware [Member] | Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 0.7	$ 1.1	$ 2.0	$ 4.8	$ 5.3