Leases - Schedule of Underlying Assets under Operating Leases (Details) $ in Millions	Dec. 31, 2024 USD ($)
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	$ 9,017.8
Less accumulated depreciation	(5,852.6)
Underlying assets under operating leases, net	3,165.2
Land
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	26.7
Building and improvements
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	350.8
Poles
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	341.6
Fiber
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	4,325.5
Copper
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	3,972.8
Equipment
Lessor Lease Description [Line Items]
Property, plant, and equipment, lessor asset under operating lease, before accumulated depreciation	$ 0.4