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Business Acquisitions - Additional Information (Details) - Conwed Plastics LLC [Member] - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jan. 20, 2017 | Jun. 30, 2018 | Jun. 30, 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 | $ 10.0 |
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 |  | 0.5 |
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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