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Debt, Long-term (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Total long-term debt | $ 810.8 | $ 798.6
Less: debt maturing within one year | 2.9 | 19.5
Total long-term debt, less current portion | 807.9 | 779.1
Pollution Control and Industrial Revenue Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate percentage, minimum | 0.20% |
Interest rate percentage, maximum | 6.50% |
Maturity date, minimum | 2013 |
Maturity date, maximum | 2035 |
Total long-term debt | 176.7 | 176.7
Unamortized discount | 0.2 | 0.2
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate percentage, minimum | 3.95% |
Interest rate percentage, maximum | 5.20% |
Maturity date, minimum | 2019 |
Maturity date, maximum | 2022 |
Total long-term debt | 598.1 | 597.9
Unamortized discount | 1.9 | 2.1
2011 Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate percentage | 3.20% |
Debt Instrument, Maturity Year | 2016 |
Total long-term debt | 24.0 | 0
Foreign Debt [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate percentage, minimum | 0.00% |
Interest rate percentage, maximum | 10.30% |
Maturity date, minimum | 2013 |
Maturity date, maximum | 2020 |
Total long-term debt | $ 12.0 | $ 24.0

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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