Mergers and Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets acquired
Goodwill	$ 646.3	$ 162.2	$ 161.5	$ 160.5
Cincinnati Bell Inc. [Member]
Assets acquired
Cash		11.2
Receivables		318.5
Inventory, materials and supplies		56.4
Prepaid expenses		5.6
Other current assets		40.5
Property, plant and equipment		1,950.7
Operating lease right-of-use assets		42.3
Goodwill		646.3
Intangible assets		969.6
Deferred tax assets		6.9
Other noncurrent assets		20.2
Total assets acquired		4,068.2
Liabilities assumed
Current portion of long-term debt		11.8
Accounts payable		381.1
Unearned revenue and customer deposits		51.2
Accrued taxes		24.6
Accrued interest		19.4
Accrued payroll and benefits		49.3
Other current liabilities		75.0
Long-term debt, less current portion		1,378.0
Operating lease liabilities		38.6
Pension and postretirement benefit obligations		151.6
Pole license agreement obligation		46.7
Deferred income tax liability		148.8
Other noncurrent liabilities		71.4
Total liabilities assumed		2,447.5
Net assets acquired		$ 1,620.7