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)