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Property, Plant and Equipment	9 Months Ended
Property, Plant and Equipment	Sep. 30, 2013
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	4. Property, Plant and Equipment Property, plant and equipment is reported net of accumulated depreciation of $686.5 million at September 30, 2013, and $658.1 million at December 31, 2012. Unpaid capital expenditure liabilities, which are noncash investing activities, were $6.6 million at September 30, 2013, and $7.3 million at September 30, 2012.

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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