Environmental (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loss Contingencies [Line Items]
Environmental remediation costs	$ 0.1	$ 14.3
Accrued environmental liability	87.9		88.9
Other Long-Term Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$ 68.9		$ 72.6

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Position (SOP)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Position (SOP)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details