Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 30.3	$ 17.8
Restricted Cash	366.5	378.7
Receivables, less allowances of $8.7 and $10.4	241.3	239.8
Inventory, materials and supplies	31.9	44.3
Prepaid expenses	22.0	22.2
Other current assets	7.3	7.6
Total current assets	699.3	710.4
Property, plant and equipment, net	1,125.8	1,129.0
Goodwill	149.4	151.0
Intangible assets, net (excluding goodwill)	124.7	132.3
Deferred income taxes, net	14.2	12.2
Other noncurrent assets	52.7	52.7
Total assets	2,166.1	2,187.6
Current liabilities
Current portion of long-term debt	16.8	18.4
Accounts payable	205.1	185.6
Unearned revenue and customer deposits	40.3	36.3
Accrued taxes	17.5	21.2
Accrued interest	26.7	29.9
Accrued payroll and benefits	30.6	28.7
Other current liabilities	31.2	37.2
Total current liabilities	368.2	357.3
Long-term debt, less current portion	1,727.3	1,729.3
Pension and postretirement benefit obligations	168.6	177.5
Deferred income tax liabilities	11.4	11.2
Other noncurrent liabilities	34.0	30.2
Total liabilities	2,309.5	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 June 30, 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; 42,440,157 and 42,197,965 shares issued and outstanding at June 30, 2018 and December 31, 2017	0.4	0.4
Additional paid-in capital	2,561.0	2,565.6
Accumulated deficit	(2,661.7)	(2,639.6)
Accumulated other comprehensive loss	(172.5)	(173.7)
Total shareowners' deficit	(143.4)	(117.9)
Total liabilities and shareowners' deficit	$ 2,166.1	$ 2,187.6