Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 10.6	$ 17.8
Restricted Cash	0.0	378.7
Receivables, less allowances of $9.8 and $10.4	286.0	239.8
Inventory, materials and supplies	44.7	44.3
Prepaid expenses	27.2	22.2
Other current assets	10.7	7.6
Total current assets	379.2	710.4
Property, plant and equipment, net	1,831.0	1,129.0
Goodwill	158.0	151.0
Intangible assets, net (excluding goodwill)	173.9	132.3
Deferred income taxes, net	60.6	12.2
Other noncurrent assets	56.8	52.7
Total assets	2,659.5	2,187.6
Current liabilities
Current portion of long-term debt	18.3	18.4
Accounts payable	281.7	185.6
Unearned revenue and customer deposits	55.7	36.3
Accrued taxes	22.6	21.2
Accrued interest	25.0	29.9
Accrued payroll and benefits	44.0	28.7
Other current liabilities	27.6	37.2
Total current liabilities	474.9	357.3
Long-term debt, less current portion	1,909.4	1,729.3
Pension and postretirement benefit obligations	225.3	177.5
Deferred income tax liabilities	11.4	11.2
Other noncurrent liabilities	72.4	30.2
Total liabilities	2,693.4	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 September 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; 50,165,394 and 42,197,965 shares issued and outstanding at September 30, 2018 and December 31, 2017	0.5	0.4
Additional paid-in capital	2,681.3	2,565.6
Accumulated deficit	(2,679.4)	(2,639.6)
Accumulated other comprehensive loss	(165.7)	(173.7)
Total shareowners' deficit	(33.9)	(117.9)
Total liabilities and shareowners' deficit	$ 2,659.5	$ 2,187.6