Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 9.3	$ 15.4
Receivables, less allowances of $13.7 and $13.0	268.6	342.8
Inventory, materials and supplies	47.5	46.5
Prepaid expenses	28.7	30.7
Other current assets	8.4	10.5
Total current assets	362.5	445.9
Property, plant and equipment, net	1,813.6	1,844.0
Operating lease right-of-use assets	37.4	0.0
Goodwill	160.1	157.0
Intangible assets, net	162.4	168.1
Deferred income tax assets	58.6	47.5
Other noncurrent assets	61.1	67.7
Total assets	2,655.7	2,730.2
Current liabilities
Current portion of long-term debt	23.2	20.2
Accounts payable	273.2	331.9
Unearned revenue and customer deposits	50.5	55.9
Accrued taxes	17.5	24.8
Accrued interest	27.0	26.8
Accrued payroll and benefits	37.5	42.9
Other current liabilities	44.9	39.2
Total current liabilities	473.8	541.7
Long-term debt, less current portion	1,913.9	1,909.6
Operating lease liabilities	33.7	0.0
Pension and postretirement benefit obligations	223.6	230.6
Pole license agreement obligation	38.6	39.1
Deferred income tax liability	12.5	11.4
Other noncurrent liabilities	71.9	72.8
Total liabilities	2,768.0	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 June 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 June 30, 2019 and December 31, 2018	0.5	0.5
Additional paid-in capital	2,677.4	2,680.0
Accumulated deficit	(2,741.8)	(2,709.4)
Accumulated other comprehensive loss	(177.8)	(175.5)
Total shareowners' deficit	(112.3)	(75.0)
Total liabilities and shareowners' deficit	$ 2,655.7	$ 2,730.2