Long-term Debt (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Notes and Loans Payable [Abstract]
Notes Payable	$ 90.0	$ 90.0
Other	0.6	0.5
Total	874.8	880.5
Less: current portion	(7.5)	(7.8)
Net long-term portion	777.3	782.7
Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	386.8
Notes and Loans Payable [Abstract]
Notes Payable	350.0	350.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Chilian Term Credit Facility Maturing 2019 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	34.5	39.3
Brazilian export financing facility, maturing 2017 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	9.0	10.0
Senior Notes Payable 2013 Thru 2018 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	112.0	112.0
Less: current portion	(90.0)
Non Recourse Notes Payable 2018 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	368.7	368.7
Recourse and non recourse [Member]
Notes and Loans Payable [Abstract]
Less: current portion	$ (97.5)	$ (97.8)

Interest rate stated in the contractual debt 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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Carrying amount of long-term debt, net of 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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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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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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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