Concentrations of Risk (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Accounts receivable, net, current		$ 713.2	$ 636.5
Office Depot (including OfficeMax) | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current		$ 31.6	$ 39.5
Office Depot (including OfficeMax) | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	8.00%
Office Depot (including OfficeMax) | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		4.00%	6.00%
Paper | Office Depot (including OfficeMax) | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	41.00%	45.00%