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Business Combinations - Intangible Assets Acquired (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 01, 2019
Nov. 15, 2018
Jun. 30, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life     14 years  
Customer relationships        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life     14 years  
Unpatented technology        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life     12 years  
Trademarks and trade names        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life     14 years  
VRV        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life   9 years    
Finite lived intangible assets acquired   $ 66.6    
Indefinite-lived intangible assets:        
Total identifiable intangible assets acquired     $ 66.6 $ 66.6
VRV | Customer relationships        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life   12 years    
Finite lived intangible assets acquired   $ 28.1    
VRV | Unpatented technology        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life   12 years    
Finite lived intangible assets acquired   $ 15.9    
VRV | Other Identifiable intangible assets        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life   4 years    
Finite lived intangible assets acquired   $ 11.8    
VRV | Trademarks and trade names        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life   14 years    
Finite lived intangible assets acquired   $ 10.8    
Harsco Corporation’s Air-X-Changers | Subsequent Event        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life 11 years      
Finite lived intangible assets acquired $ 254.5      
Indefinite-lived intangible assets:        
Trademarks 55.5      
Total identifiable intangible assets acquired $ 310.0      
Harsco Corporation’s Air-X-Changers | Subsequent Event | Customer relationships        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life 12 years      
Finite lived intangible assets acquired $ 179.1      
Harsco Corporation’s Air-X-Changers | Subsequent Event | Developed Technology        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life 10 years      
Finite lived intangible assets acquired $ 47.0      
Harsco Corporation’s Air-X-Changers | Subsequent Event | Backlog        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life 1 year      
Finite lived intangible assets acquired $ 27.3      
Harsco Corporation’s Air-X-Changers | Subsequent Event | Non-compete agreements        
Acquired Finite-Lived Intangible Assets        
Weighted-average Estimated Useful Life 4 years      
Finite lived intangible assets acquired $ 1.1