Business Acquisitions Business Acquisitions - Actual and Pro Forma Net Sales and Income from Continuing Operations (Details) - USD ($) $ in Millions	2 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Conwed Plastics LLC [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Sales, Actual		$ 141.3
Net Sales, Pro Forma			$ 989.8	$ 984.1
(Loss) Income from Continuing Operations, Actual		$ 11.9
(Loss) Income from Continuing Operations, Pro Forma			$ 31.1	$ 90.6
Argotec [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net Sales, Actual	$ 22.3
Net Sales, Pro Forma					$ 859.7
(Loss) Income from Continuing Operations, Actual	$ 0.9
(Loss) Income from Continuing Operations, Pro Forma					$ 90.2