Acquisitions - Additional Information (Details) $ in Millions		6 Months Ended	9 Months Ended		12 Months Ended
	Jan. 05, 2016 folding_carton_facility	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Number of folding carton facilities acquired | folding_carton_facility	2
Purchase price, net of cash acquired			$ 331.9	$ 113.6
2016 Acquisitions
Business Acquisition [Line Items]
Purchase price		$ 337.4	343.3
Purchase price, net of cash acquired		332.0
Debt assumed in business combination		$ 31.1	$ 31.1
North American Acquisitions
Business Acquisition [Line Items]
Purchase price					$ 164.0