Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 6.5	$ 15.4
Receivables, less allowances of $14.3 and $13.0	253.2	342.8
Inventory, materials and supplies	49.6	46.5
Prepaid expenses	29.3	30.7
Other current assets	11.0	10.5
Total current assets	349.6	445.9
Property, plant and equipment, net	1,796.1	1,844.0
Operating lease right-of-use assets	35.9	0.0
Goodwill	159.6	157.0
Intangible assets, net	158.2	168.1
Deferred income tax assets	59.5	47.5
Other noncurrent assets	60.1	67.7
Total assets	2,619.0	2,730.2
Current liabilities
Current portion of long-term debt	23.4	20.2
Accounts payable	248.7	331.9
Unearned revenue and customer deposits	50.8	55.9
Accrued taxes	22.8	24.8
Accrued interest	24.6	26.8
Accrued payroll and benefits	49.5	42.9
Other current liabilities	44.5	39.2
Total current liabilities	464.3	541.7
Long-term debt, less current portion	1,904.0	1,909.6
Operating lease liabilities	32.2	0.0
Pension and postretirement benefit obligations	220.1	230.6
Pole license agreement obligation	38.3	39.1
Deferred income tax liability	12.2	11.4
Other noncurrent liabilities	75.5	72.8
Total liabilities	2,746.6	2,805.2
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, 2019 and December 31, 2018; liquidation preference $1,000 per share ($50 per depositary share)	129.4	129.4
Common shares, $.01 par value; 96,000,000 shares authorized; 50,420,449 and 50,184,114 shares issued and outstanding at September 30, 2019 and December 31, 2018	0.5	0.5
Additional paid-in capital	2,676.8	2,680.0
Accumulated deficit	(2,755.4)	(2,709.4)
Accumulated other comprehensive loss	(178.9)	(175.5)
Total shareowners' deficit	(127.6)	(75.0)
Total liabilities and shareowners' deficit	$ 2,619.0	$ 2,730.2