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Cost Classifications (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Costs and Expenses [Abstract]        
Depreciation and amortization not included in cost of product sold $ 1.7 $ 1.8 $ 3.3 $ 3.6
Depreciation and amortization not included in direct operating expenses 46.7 38.8 83.0 77.3
Depreciation and amortization not included in selling, general and administrative expenses $ 2.3 $ 1.9 $ 4.4 $ 3.6