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Business Acquisitions and Assets and Liabilities Held for Sale (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
acquisition
Jul. 10, 2018
Jun. 07, 2018
Jun. 04, 2018
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Number of businesses acquired | acquisition   6        
Cost of acquired entity purchase price   $ 1,188.3        
Goodwill acquired   663.6        
Other identifiable intangibles added   660.7        
Deferred taxes   958.2       $ 829.6
Held-for-sale | Gatan, Inc.            
Business Acquisition [Line Items]            
Deferred taxes $ 10.0          
Thermo Fisher | Held-for-sale | Gatan, Inc.            
Business Acquisition [Line Items]            
Cost of acquired entity purchase price $ 925.0          
Percentage of shares agreed to be sold 100.00%          
Customer related intangibles            
Business Acquisition [Line Items]            
Intangible assets other than goodwill   $ 589.7        
Weighted average useful life   19 years        
Technology            
Business Acquisition [Line Items]            
Intangible assets other than goodwill   $ 44.1        
Weighted average useful life   8 years        
PowerPlan, Inc.            
Business Acquisition [Line Items]            
Percentage of shares acquired         100.00%  
ConceptShare, Inc.            
Business Acquisition [Line Items]            
Percentage of shares acquired       100.00%    
BillBlast            
Business Acquisition [Line Items]            
Percentage of shares acquired     100.00%      
Software Solutions, Cost Estimates Within Construction Industry            
Business Acquisition [Line Items]            
Number of businesses acquired | acquisition   3