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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Q3) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 22, 2018
Dec. 31, 2017
Dec. 04, 2017
Oct. 02, 2017
Apr. 05, 2017
Mar. 13, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                
Goodwill $ 2,412,554   $ 2,460,103         $ 2,078,765
Annax                
Business Acquisition [Line Items]                
Current assets   $ 34,036            
Property, plant & equipment   674            
Goodwill   14,301            
Other intangible assets   23,998            
Total assets acquired   73,009            
Total liabilities assumed   (44,345)            
Net assets acquired   $ 28,664            
Melett                
Business Acquisition [Line Items]                
Current assets       $ 35,258        
Property, plant & equipment       5,917        
Goodwill       25,732        
Other intangible assets       30,479        
Total assets acquired       97,386        
Total liabilities assumed       (25,493)        
Net assets acquired       $ 71,893        
AM General                
Business Acquisition [Line Items]                
Current assets         $ 6,610      
Property, plant & equipment         4,140      
Goodwill         12,944      
Other intangible assets         12,097      
Total assets acquired         35,791      
Total liabilities assumed         (25,375)      
Net assets acquired         $ 10,416      
TTC                
Business Acquisition [Line Items]                
Current assets           $ 3,744    
Property, plant & equipment           5,413    
Goodwill           14,095    
Other intangible assets           12,300    
Total assets acquired           35,552    
Total liabilities assumed           (3,041)    
Net assets acquired           $ 32,511    
ATP                
Business Acquisition [Line Items]                
Current assets             $ 11,666  
Property, plant & equipment             5,354  
Goodwill             29,034  
Other intangible assets             25,000  
Total assets acquired             71,054  
Total liabilities assumed             (5,800)  
Net assets acquired             $ 65,254