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Acquisitions and Dispositions - Summary of Intangible Assets and Amortization Periods (Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jun. 28, 2019 | Dec. 31, 2019
Clean Earth |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Customer Relationships |  | $ (12.9)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Permits |  | (6.0)
Measurement Period Adjustments |  | (18.9)
Clean Earth |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets of Altek | $ 261.1 | 242.2
Clean Earth | Permits And Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 18 years |
Total identifiable intangible assets of Altek | $ 176.1 | 170.1
Clean Earth | Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 7 years 6 months |
Total identifiable intangible assets of Altek | $ 33.4 | 20.5
Clean Earth | Air Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 26 years 6 months |
Total identifiable intangible assets of Altek | $ 25.6 | 25.6
Clean Earth | Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 11 years 6 months |
Total identifiable intangible assets of Altek | $ 26.0 | 26.0
Clean Earth | Clean Earth |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets of Altek | $ 261.1 | 242.2
Measurement Period Adjustments |  | $ (18.9)

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=SL65897772-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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