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Business Combinations - Harsco Corporation’s Air-X-Changers Narratives (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 01, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition
Payment for acquisition of businesses, net of cash acquired				$ 603.9	$ 12.5
Harsco Corporation’s Air-X-Changers
Business Acquisition
Payment for acquisition of businesses, net of cash acquired	$ 599.7
Payments for acquisition of business excluding working capital adjustments		$ 592.0
Payment for working capital adjustments		7.7
Transaction related costs		$ 4.2	$ 1.2
Harsco Corporation’s Air-X-Changers | Minimum
Business Acquisition
Finite lived intangible assets useful life	1 year
Harsco Corporation’s Air-X-Changers | Maximum
Business Acquisition
Finite lived intangible assets useful life	12 years

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