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Business Combination - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 20, 2019
Oct. 01, 2018
Jul. 31, 2018
Dec. 11, 2017
Jun. 29, 2019
Sep. 29, 2018
Business Acquisition [Line Items]            
Goodwill         $ 2,566.4 $ 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     $ 45.6      
Payment of additional acquisition consideration         $ 2.6  
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   $ 30.7        
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        
SuperSonic Imagine            
Business Acquisition [Line Items]            
Consideration transferred $ 85.0          
Percentage of outstanding shares acquired 46.00%