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Cost Classifications (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Cost Classifications        
Depreciation and amortization not included in cost of product sold $ 0.9 $ 0.6 $ 1.6 $ 1.3
Depreciation and amortization not included in direct operating expenses 30.7 20.9 61.5 41.8
Depreciation and amortization not included in selling, general and administrative expenses $ 0.6 $ 0.5 $ 1.2 $ 1.0