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Business Acquisitions - Additional Information (Details) - Conwed Plastics LLC [Member] - USD ($) $ in Millions		3 Months Ended
	Jan. 20, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Consideration, cash	$ 295.0
Potential earn-out payments	40.0
Consideration, acquisition-date fair value of earn-out payments	8.6	$ 9.7
Consideration, total	303.6
Accounts receivable, fair value	15.4
Accounts receivable, gross contractual amount	15.8
Inventory acquired	20.6
Financing costs			$ 0.6
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		0.2
Inventory step-up in basis [Member]
Business Acquisition [Line Items]
Inventory acquired	$ 2.9
Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Acquisition-related costs		$ 0.0	$ 0.1

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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