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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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Interest rate stated in the contractual debt agreement.

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When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

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

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