Write-downs, Reserves, and Project Opening Costs, net of Recoveries (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Write-downs and reserves, and project opening costs, net of recoveries:
Remediation costs	$ 6.9	$ 3.6	$ 19.0	$ 6.0
Divestitures and abandonments	12.1	1.9	13.9	8.1
Efficiency projects	0	1.7	0	7.8
Project opening costs	2.9	0.1	4.6	1.8
Other	1.5	0.6	6.6	0.4
Total write-downs, reserves, and project opening costs, net of recoveries	$ 23.4	$ 7.9	$ 44.1	$ 24.1

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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