Long-term Debt and Other Financing Long-term debt table (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Unamortized debt (discount) premium, net	$ (32.1)	$ (33.1)
Total debt	1,657.8	1,507.0
Current portion of long-term debt	0.6	0.8
Total long-term debt	1,657.2	1,506.2
Senior Secured Notes Due December 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	380.0	380.0
Debt Instrument, Interest Rate, Stated Percentage	8.75%
Exchangeable Senior Notes Due November 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	150.0	150.0
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Debt Instrument, Interest Rate, Effective Percentage	10.80%	10.80%
Senior Notes Due May 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	529.8	529.8
Debt Instrument, Interest Rate, Stated Percentage	7.625%
Senior Notes Due April 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	290.2	290.2
Debt Instrument, Interest Rate, Stated Percentage	8.375%
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	99.9	100.1
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility	$ 240.0	$ 90.0

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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