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Subsequent Events (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Fulfillment_center
Corrugated_product_plant
Design_center
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Fulfillment_center
Corrugated_product_plant
Design_center
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Subsequent Event [Line Items]            
Net sales   $ 1,417.4 $ 1,454.3 $ 2,818.4 $ 2,880.0  
TimBar Corporation            
Subsequent Event [Line Items]            
Net sales           $ 324.0
Number of Corrugated product plants | Corrugated_product_plant   5   5    
Number of fulfillment centers | Fulfillment_center   2   2    
Number of design centers | Design_center   4   4    
Forecast | TimBar Corporation            
Subsequent Event [Line Items]            
Cash purchase price $ 386.0