Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax benefit related to continuing operations for the three and nine months ended September 30, 2020 was $1.7 million and $4.6 million, respectively. Income tax expense related to continuing operations for the three and nine months ended September 30, 2019 was $12.6 million and $17.8 million, respectively. Income tax benefit for the three and nine months ended September 30, 2020 compared with income tax expense for the same periods in 2019 is the result of lower pretax income, primarily resulting from decreased operating income due to impacts of COVID-19 and incremental acquisition and integration costs in connection with the Company's acquisitions of approximately $8.1 million and $23.9 million for the three and nine months ended September 30, 2020, respectively, as well as a $2.8 million favorable income tax adjustment in connection with an increase in estimated usage of assumed net operating losses related to the Clean Earth acquisition and a $2.8 million valuation allowance adjustment against a deferred tax asset due to a lower projected income in a certain jurisdiction in 2019 not recurring in 2020.An income tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, based on technical merits, including resolutions of any related appeals or litigation processes. The reserve for uncertain tax positions at September 30, 2020 was $4.0 million, including interest and penalties.  Within the next twelve months, it is reasonably possible that $0.3 million unrecognized income tax benefits will be recognized upon settlement of tax examinations and the expiration of various statutes of limitations.