Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 10.6	$ 11.6
Receivables, less allowances of $16.7 and $14.3	270.0	307.7
Inventory, materials and supplies	43.3	44.6
Prepaid expenses	31.5	28.3
Other current assets	9.0	11.6
Total current assets	364.4	403.8
Property, plant and equipment, net	1,761.1	1,780.8
Operating lease right-of-use assets	34.1	35.8
Goodwill	156.8	160.5
Intangible assets, net	148.4	155.4
Deferred income tax assets	80.5	59.3
Other noncurrent assets	54.3	58.2
Total assets	2,599.6	2,653.8
Current liabilities
Current portion of long-term debt	21.8	22.3
Accounts payable	274.5	284.6
Unearned revenue and customer deposits	54.1	59.1
Accrued taxes	19.2	29.1
Accrued interest	24.6	26.8
Accrued payroll and benefits	43.5	49.0
Other current liabilities	51.6	52.6
Total current liabilities	489.3	523.5
Long-term debt, less current portion	1,927.2	1,901.3
Operating lease liabilities	31.2	32.1
Pension and postretirement benefit obligations	211.1	215.5
Pole license agreement obligation	37.7	38.0
Deferred income tax liabilities	10.7	11.7
Other noncurrent liabilities	81.1	71.7
Total liabilities	2,788.3	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 March 31, 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; 50,564,267 and 50,420,700 shares issued and outstanding at March 31, 2020 and December 31, 2019	0.5	0.5
Additional paid-in capital	2,674.2	2,676.2
Accumulated deficit	(2,810.0)	(2,776.0)
Accumulated other comprehensive loss	(182.8)	(170.1)
Total shareowners' deficit	(188.7)	(140.0)
Total liabilities and shareowners' deficit	$ 2,599.6	$ 2,653.8