Acquisitions - Additional Disclosures (Details) T in Thousands, $ in Millions				1 Months Ended	12 Months Ended
	Feb. 04, 2015 folding_carton_facility	Jan. 02, 2015 folding_carton_facility	May. 23, 2014 USD ($) Facilities T	Feb. 04, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Cash payments to acquire business					$ 190.7
North American Acquisitions
Business Acquisition [Line Items]
Purchase Price				$ 164.2
Cascades
Business Acquisition [Line Items]
Number of folding carton facilities acquired | folding_carton_facility	3
Rose City
Business Acquisition [Line Items]
Number of folding carton facilities acquired | folding_carton_facility		2
Benson
Business Acquisition [Line Items]
Cash payments to acquire business			$ 190.7
Number of operating facilities | Facilities			4
Annual amount of paperboard processed (in tons) | T			80