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Cost Classifications (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Cost Classifications        
Depreciation and amortization not included in cost of product sold $ 1.5 $ 1.3 $ 3.0 $ 2.4
Depreciation and amortization not included in direct operating expenses 35.6 33.2 70.0 65.7
Depreciation and amortization not included in selling, general and administrative expenses $ 1.5 $ 0.5 $ 2.9 $ 1.1