Property, Plant and Equipment	6 Months Ended
Property, Plant and Equipment	Jun. 30, 2011
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 $622.4 million at June 30, 2011, and $594.3 million at December 31, 2010. Unpaid capital expenditure liabilities, which are noncash investing activities, were $7.3 million at June 30, 2011, and $6.1 million at June 30, 2010.

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

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