Concentrations of Risk (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 631.4		$ 636.5
Office Depot (including OfficeMax) | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 33.9		$ 39.5
Office Depot (including OfficeMax) | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	10.00%
Office Depot (including OfficeMax) | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%		6.00%
Paper | Office Depot (including OfficeMax) | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	44.00%	46.00%	45.00%