Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3.9	$ 15.4
Receivables, less allowances of $13.1 and $13.0	260.0	342.8
Inventory, materials and supplies	38.9	46.5
Prepaid expenses	31.7	30.7
Other current assets	9.9	10.5
Total current assets	344.4	445.9
Property, plant and equipment, net	1,832.8	1,844.0
Operating lease right-of-use assets	37.2	0.0
Goodwill	158.6	157.0
Intangible assets, net (excluding goodwill)	165.2	168.1
Deferred income taxes, net	47.4	47.5
Other noncurrent assets	63.7	67.7
Total assets	2,649.3	2,730.2
Current liabilities
Current portion of long-term debt	22.4	20.2
Accounts payable	259.3	331.9
Unearned revenue and customer deposits	49.3	55.9
Accrued taxes	18.2	24.8
Accrued interest	24.8	26.8
Accrued payroll and benefits	42.3	42.9
Other current liabilities	44.5	39.2
Total current liabilities	460.8	541.7
Long-term debt, less current portion	1,909.9	1,909.6
Operating lease liabilities	34.5	0.0
Pension and postretirement benefit obligations	226.7	230.6
Pole license agreement obligation	38.8	39.1
Deferred income tax liabilities	12.4	11.4
Other noncurrent liabilities	68.5	72.8
Total liabilities	2,751.6	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 March 31, 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; 50,360,602 and 50,184,114 shares issued and outstanding at March 31, 2019 and December 31, 2018	0.5	0.5
Additional paid-in capital	2,678.4	2,680.0
Accumulated deficit	(2,736.3)	(2,709.4)
Accumulated other comprehensive loss	(174.3)	(175.5)
Total shareowners' deficit	(102.3)	(75.0)
Total liabilities and shareowners' deficit	$ 2,649.3	$ 2,730.2