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Business Acquisitions - Additional Information (Details) - Conwed Plastics LLC [Member] - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 20, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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 |  |  |
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 |  |
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 |  |  | $ 0.1 | $ 1.4

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