Leases - Narratives (Details) - USD ($) $ in Millions		4 Months Ended	8 Months Ended	12 Months Ended
	Aug. 31, 2021	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 01, 2021	Jan. 01, 2021
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				5 years
Lease expiration period				2066
Lessee, operating lease, existence of option to extend				true
Lessee, finance lease, renewal term				15 years
Lessee, operating lease, existence of option to terminate				true
Additional future payments on operating leases not yet commenced		$ 6.4		$ 6.4
Sale leaseback transaction sale price	$ 9.1
Net proceeds from sale-leaseback transaction after transaction cost	6.6
Gain (loss) on sale	$ 2.8
Operating lease right-of-use assets		44.3		$ 44.3	$ 37.4
Lessor lease expiration period				2048
Lease income		$ 0.9	$ 2.0		2.9	$ 3.1
Hawaiian Telcom Holdco, Inc. [Member]
Lessee, Lease, Description [Line Items]
Sale leaseback transaction sale price					3.7
Net proceeds from sale-leaseback transaction after transaction cost					$ 3.5
Leaseback Agreement [Member]
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets							$ 7.7
Operating lease right of use liability							$ 7.7
Leaseback Agreement [Member] | Hawaiian Telcom Holdco, Inc. [Member]
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets								$ 1.1
Operating lease right of use liability								$ 1.1
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term		5 years		5 years
Operating lease term		1 year		1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term		10 years		10 years
Operating lease term		30 years		30 years
Real Estate | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				1 year
Real Estate | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				55 years
Equipment [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				3 years
Equipment [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				5 years
Cell Towers [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				4 years
Cell Towers [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract				21 years