Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 8.8	$ 11.6
Receivables, less allowances of $20.2 and $14.3	280.1	307.7
Inventory, materials and supplies	28.7	44.6
Prepaid expenses	30.8	28.3
Other current assets	13.2	11.6
Total current assets	361.6	403.8
Property, plant and equipment, net	1,732.5	1,780.8
Operating lease right-of-use assets	34.1	35.8
Goodwill	159.3	160.5
Intangible assets, net	143.4	155.4
Deferred income tax assets	86.2	59.3
Other noncurrent assets	46.7	58.2
Total assets	2,563.8	2,653.8
Current liabilities
Current portion of long-term debt	21.6	22.3
Accounts payable	223.6	284.6
Unearned revenue and customer deposits	50.3	59.1
Accrued taxes	20.4	29.1
Accrued interest	24.5	26.8
Accrued payroll and benefits	62.8	49.0
Other current liabilities	46.9	52.6
Total current liabilities	450.1	523.5
Long-term debt, less current portion	1,936.4	1,901.3
Operating lease liabilities	30.9	32.1
Pension and postretirement benefit obligations	216.9	215.5
Pole license agreement obligation	37.1	38.0
Deferred income tax liability	10.8	11.7
Other noncurrent liabilities	86.1	71.7
Total liabilities	2,768.3	2,793.8
Shareowners' Deficit [Abstract]
Preferred stock, 2,357,299 shares authorized, 155,250 shares (3,105,000 depositary shares) of 6 3/4% Cumulative Convertible Preferred Stock issued and outstanding at September 30, 2020 and December 31, 2019; liquidation preference $1,000 per share ($50 per depositary share)	129.4	129.4
Common shares, $.01 par value; 96,000,000 shares authorized; 50,680,605 and 50,420,700 shares issued and outstanding at September 30, 2020 and December 31, 2019	0.5	0.5
Additional paid-in capital	2,671.5	2,676.2
Accumulated deficit	(2,826.0)	(2,776.0)
Accumulated other comprehensive loss	(179.9)	(170.1)
Total shareowners' deficit	(204.5)	(140.0)
Total liabilities and shareowners' deficit	$ 2,563.8	$ 2,653.8