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Business Combination - Narrative (Details) - USD ($)
$ in Millions
Oct. 01, 2018
Jul. 31, 2018
Dec. 11, 2017
Dec. 29, 2018
Sep. 29, 2018
Business Acquisition [Line Items]          
Goodwill       $ 2,562.9 $ 2,533.2
Emsor          
Business Acquisition [Line Items]          
Consideration transferred     $ 16.3    
Purchase price withheld     $ 0.5 4.9  
Period for payment of contingent consideration liabilities     18 months    
Period of cumulative revenue to trigger payment of contingent consideration liability     2 years    
Goodwill       5.7  
Property, plant and equipment       6.0  
Emsor | Customer relationships          
Business Acquisition [Line Items]          
Identifiable intangible assets     $ 4.6    
Faxitron          
Business Acquisition [Line Items]          
Consideration transferred   $ 89.5      
Purchase price withheld   $ 11.7   $ 2.9  
Period for payment of contingent consideration liabilities   1 year      
Goodwill   $ 42.4      
Faxitron | Developed technology          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 44.9      
Weighted average period   9 years      
Faxitron | In-process research and development          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 5.5      
Faxitron | In-process research and development | Minimum | Discount Rate          
Business Acquisition [Line Items]          
Intangible assets, fair value (percentage)   17.00%      
Faxitron | In-process research and development | Maximum | Discount Rate          
Business Acquisition [Line Items]          
Intangible assets, fair value (percentage)   19.00%      
Faxitron | Customer relationships          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 0.5      
Weighted average period   9 years      
Faxitron | Trade names          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 2.3      
Weighted average period   7 years      
Focal Therapeutics          
Business Acquisition [Line Items]          
Consideration transferred $ 120.1        
Purchase price withheld $ 14.0        
Period for payment of contingent consideration liabilities 1 year        
Goodwill $ 30.4        
Focal Therapeutics | Developed technology          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 83.1        
Weighted average period 11 years        
Focal Therapeutics | In-process research and development          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 11.4        
Focal Therapeutics | In-process research and development | Minimum | Discount Rate          
Business Acquisition [Line Items]          
Intangible assets, fair value (percentage) 15.50%        
Focal Therapeutics | In-process research and development | Maximum | Discount Rate          
Business Acquisition [Line Items]          
Intangible assets, fair value (percentage) 16.50%        
Focal Therapeutics | Trade names          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 2.7        
Weighted average period 13 years