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Cost Classifications (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Cost Classifications        
Depreciation and amortization not included in cost of product sold $ 1.8 $ 1.5 $ 3.6 $ 3.0
Depreciation and amortization not included in direct operating expenses 38.8 35.6 77.3 70.0
Depreciation and amortization not included in selling, general and administrative expenses $ 1.9 $ 1.5 $ 3.6 $ 2.9