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Cost Classifications (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cost Classifications    
Depreciation and amortization not included in cost of product sold $ 0.7 $ 0.6
Depreciation and amortization not included in direct operating expenses 30.8 20.9
Depreciation and amortization not included in selling, general and administrative expenses $ 0.6 $ 0.5