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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2019 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  |  | $ 2.5 | $ 13.9
PWE |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price, inclusive of preliminary working capital adjustment |  |  |  | 6.2 |
Goodwill acquired |  |  |  | $ 2.5 |
MRL |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price, inclusive of preliminary working capital adjustment |  | $ 49.8 |  |  |
Goodwill acquired | [1] | 13.9 |  |  |
Business acquisition purchase price adjustment |  |  | $ 0.8 |  |
Contingent consideration maximum |  | $ 15.5 |  |  |
[1] | Goodwill, the majority of which is tax-deductible, has been allocated to the Environmental Solutions Group on the basis that the synergies identified will primarily benefit this segment.

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