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Long-term Debt and Other Financing Debt Instrument Table (Details)
1 Months Ended 12 Months Ended
Sep. 16, 2014
USD ($)
Nov. 30, 2012
USD ($)
Dec. 31, 2015
USD ($)
shares
$ / shares
Dec. 31, 2013
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]            
Unamortized discount/premium and debt issuance costs     $ (51,400,000)   $ (48,700,000) $ (62,300,000)
Total long-term debt     2,354,100,000   2,336,400,000 2,422,000,000
Capital Lease Obligations     0   9,600,000  
Long-term Debt [Member] | Research And Innovation Center Middletown OH [Member]            
Debt Instrument [Line Items]            
Capital Lease Obligations         9,600,000  
Property, Plant and Equipment [Member] | Research And Innovation Center Middletown OH [Member]            
Debt Instrument [Line Items]            
Capital Leased Assets, Gross         9,600,000  
Other Income (Expense) [Member]            
Debt Instrument [Line Items]            
Gain (Loss) on Repurchase of Debt Instrument     9,400,000 $ 2,900,000    
Senior Secured Notes Due December 2018 [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 380,000,000   $ 380,000,000 $ 380,000,000
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)     8.75%   8.75% 8.75%
Debt Instrument, Maturity Date     Dec. 01, 2018      
Assets Pledged as Collateral, Carrying Amount     $ 1,600,000,000      
Senior Secured Notes Due December 2018 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     104.375%      
Debt Instrument, Redemption Period, Start Date     Dec. 01, 2015      
Debt Instrument, Redemption Period, End Date     Nov. 30, 2016      
Senior Secured Notes Due December 2018 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     102.188%      
Debt Instrument, Redemption Period, Start Date     Dec. 01, 2016      
Debt Instrument, Redemption Period, End Date     Nov. 30, 2017      
Senior Secured Notes Due December 2018 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     100.00%      
Debt Instrument, Redemption Period, Start Date     Dec. 01, 2017      
Debt Instrument, Redemption Period, End Date     Nov. 30, 2018      
Exchangeable Senior Notes Due November 2019 [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 150,000,000   $ 150,000,000 $ 150,000,000
Debt Instrument, Face Amount     $ 150,000,000      
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)     5.00%   5.00% 5.00%
Debt Instrument, Maturity Date     Nov. 15, 2019      
Debt Instrument, Convertible, Effective Interest Rate     10.80%   10.80% 10.80%
Debt Instrument, Convertible, Stock Price Trigger | $ / shares     $ 7.02      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger     130.00%      
Debt Instrument, Convertible, Threshold Trading Days     20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days     30 days      
Debt Instrument, Convertible, Conversion Ratio (in shares per $1,000 principal amount)     185.1852      
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 5.40      
Debt Instrument, Convertible, Number of Equity Instruments Used to Determine Consideration to Be Delivered Upon Conversion (in shares) | shares     27,800,000      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt   $ 38,700,000        
Debt Instrument, Unamortized Discount     $ 24,900,000     $ 29,900,000
Carrying Value of Long-term Debt     $ 125,100,000     120,100,000
Exchangeable Senior Notes Due November 2019 [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, Number Of Equity Instruments (in shares) | shares     37,500,000      
Senior Notes Due May 2020 [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 529,800,000   $ 529,800,000 $ 529,800,000
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)     7.625%   7.625% 7.625%
Debt Instrument, Maturity Date     May 15, 2020      
Debt Instrument, Repurchased Face Amount       20,200,000    
Senior Notes Due May 2020 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     103.813%      
Debt Instrument, Redemption Period, Start Date     May 15, 2015      
Debt Instrument, Redemption Period, End Date     May 14, 2016      
Senior Notes Due May 2020 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     102.542%      
Debt Instrument, Redemption Period, Start Date     May 15, 2016      
Debt Instrument, Redemption Period, End Date     May 14, 2017      
Senior Notes Due May 2020 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     101.271%      
Debt Instrument, Redemption Period, Start Date     May 15, 2017      
Debt Instrument, Redemption Period, End Date     May 14, 2018      
Senior Notes Due May 2020 [Member] | Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     100.00%      
Debt Instrument, Redemption Period, Start Date     May 15, 2018      
Debt Instrument, Redemption Period, End Date     May 14, 2020      
Senior Notes Due October 2021 [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 406,200,000   $ 406,200,000 $ 430,000,000
Debt Instrument, Face Amount $ 430,000,000          
Debt Instrument, Interest Rate, Stated Percentage (in hundredths) 7.625%   7.625%   7.625% 7.625%
Debt Instrument, Maturity Date Oct. 01, 2021   Oct. 01, 2021      
Debt Instrument, Repurchased Face Amount     $ 23,800,000      
Senior Notes Due October 2021 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption, Description     Before October 1, 2017, we may redeem the 2021 Notes at a price equal to par plus a make-whole premium and all accrued and unpaid interest to the date of redemption.      
Debt Instrument, Redemption Period, End Date     Sep. 30, 2017      
Senior Notes Due October 2021 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     103.813%      
Debt Instrument, Redemption Period, Start Date     Oct. 01, 2017      
Debt Instrument, Redemption Period, End Date     Sep. 30, 2018      
Senior Notes Due October 2021 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     101.906%      
Debt Instrument, Redemption Period, Start Date     Oct. 01, 2018      
Debt Instrument, Redemption Period, End Date     Sep. 30, 2019      
Senior Notes Due October 2021 [Member] | Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     100.00%      
Debt Instrument, Redemption Period, Start Date     Oct. 01, 2019      
Debt Instrument, Redemption Period, End Date     Sep. 30, 2021      
Senior Notes Due April 2022 [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 290,200,000   $ 290,200,000 $ 290,200,000
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)     8.375%   8.375% 8.375%
Debt Instrument, Maturity Date     Apr. 01, 2022      
Debt Instrument, Repurchased Face Amount       $ 9,800,000    
Senior Notes Due April 2022 [Member] | Debt Instrument, Redemption, Period One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption, Description     Before April 1, 2017, we may redeem the 2022 Notes at a price equal to par plus a make-whole premium and all accrued and unpaid interest to the date of redemption.      
Debt Instrument, Redemption Period, End Date     Mar. 31, 2017      
Senior Notes Due April 2022 [Member] | Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     104.188%      
Debt Instrument, Redemption Period, Start Date     Apr. 01, 2017      
Debt Instrument, Redemption Period, End Date     Mar. 31, 2018      
Senior Notes Due April 2022 [Member] | Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     102.792%      
Debt Instrument, Redemption Period, Start Date     Apr. 01, 2018      
Debt Instrument, Redemption Period, End Date     Mar. 31, 2019      
Senior Notes Due April 2022 [Member] | Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     101.396%      
Debt Instrument, Redemption Period, Start Date     Apr. 01, 2019      
Debt Instrument, Redemption Period, End Date     Mar. 31, 2020      
Senior Notes Due April 2022 [Member] | Debt Instrument, Redemption, Period Five [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Redemption Price Percentage     100.00%      
Debt Instrument, Redemption Period, Start Date     Apr. 01, 2020      
Debt Instrument, Redemption Period, End Date     Mar. 31, 2022      
Unsecured Industrial Revenue Bonds [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 73,300,000      
Long-term Debt, Weighted Average Interest Rate     6.80%      
Secured Industrial Revenue Bonds [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 26,000,000      
Industrial Revenue Bonds [Member]            
Debt Instrument [Line Items]            
Long-term debt, gross     $ 99,300,000   $ 99,300,000 $ 99,300,000
Debt Instrument, Maturity Date Range, Start     Jun. 01, 2020      
Debt Instrument, Maturity Date Range, End     Jun. 01, 2028      
Taxable Tax Increment Revenue Bonds Issued [Member] | Spencer County Bonds [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 23,000,000      
Deficiency Payments     1,300,000      
Long-term Debt Maturities, Repayments of Principal and Interest     10,400,000      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Credit Facility     550,000,000   520,000,000 $ 605,000,000
Minimum Amount Of Borrowing Capacity For A Fixed Charge Coverage Ratio Applies     $ 150,000,000   $ 150,000,000