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Acquisitions Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 19, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
business
Dec. 31, 2016
USD ($)
business
Dec. 31, 2015
USD ($)
business
Aug. 31, 2017
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired   $ 1,556.6 $ 190.1 $ 37.1  
Gain from acquisition   15.3 0.0 0.0  
Goodwill attributable to acquisitions   1,035.2 113.2    
Acquisitions, 2017 [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired   1,556.6      
Goodwill attributable to acquisitions   $ 1,035.2      
Number of businesses acquired | business   3      
Transaction costs   $ 19.0      
Goodwill, purchase accounting adjustments   56.0      
Others          
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired   799.9      
Revenue of prior fiscal year     246.0    
Goodwill attributable to acquisitions   520.8      
Acquisitions, Landauer [Member]          
Business Acquisition [Line Items]          
Acquisition, share price (USD per Share) | $ / shares $ 67.25        
Payments to acquire businesses, net of cash acquired $ 760.0 756.7      
Revenue of prior fiscal year     143.0    
Goodwill attributable to acquisitions   514.4      
Acquisitions, Orpak [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired         80.00%
Gain from acquisition   $ 15.3      
Acquisitions, 2016 [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired     190.1    
Revenue of prior fiscal year     47.0    
Goodwill attributable to acquisitions     $ 113.2    
Number of businesses acquired | business     3    
Acquisitions, 2015 [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired       37.1  
Revenue of prior fiscal year       18.0  
Goodwill attributable to acquisitions       $ 21.2  
Number of businesses acquired | business       2