Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 32.4	$ 17.8
Restricted Cash	379.8	378.7
Receivables, less allowances of $9.6 and $10.4	232.4	239.8
Inventory, materials and supplies	45.0	44.3
Prepaid expenses	23.7	22.2
Other current assets	9.4	7.6
Total current assets	722.7	710.4
Property, plant and equipment, net	1,118.8	1,129.0
Goodwill	150.7	151.0
Intangible assets, net (excluding goodwill)	128.7	132.3
Deferred income taxes, net	13.1	12.2
Other noncurrent assets	52.0	52.7
Total assets	2,186.0	2,187.6
Current liabilities
Current portion of long-term debt	18.2	18.4
Accounts payable	195.7	185.6
Unearned revenue and customer deposits	39.3	36.3
Accrued taxes	18.0	21.2
Accrued interest	33.1	29.9
Accrued payroll and benefits	39.5	28.7
Other current liabilities	29.2	37.2
Total current liabilities	373.0	357.3
Long-term debt, less current portion	1,726.9	1,729.3
Pension and postretirement benefit obligations	173.2	177.5
Deferred income tax liabilities	12.2	11.2
Other noncurrent liabilities	28.6	30.2
Total liabilities	2,313.9	2,305.5
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, 2018 and December 31, 2017; liquidation preference $1,000 per share ($50 per depositary share)	129.4	129.4
Common shares, $.01 par value; 96,000,000 shares authorized; 42,394,151 and 42,197,965 shares issued and outstanding at March 31, 2018 and December 31, 2017	0.4	0.4
Additional paid-in capital	2,562.2	2,565.6
Accumulated deficit	(2,647.9)	(2,639.6)
Accumulated other comprehensive loss	(172.0)	(173.7)
Total shareowners' deficit	(127.9)	(117.9)
Total liabilities and shareowners' deficit	$ 2,186.0	$ 2,187.6