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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 22, 2019
Feb. 25, 2019
Mar. 22, 2018
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]                
Acquisitions of businesses, net of cash acquired           $ 3,000.6 $ 49.1  
Goodwill       $ 8,103.2   8,103.2   $ 2,396.5
General Electric Company                
Business Acquisition [Line Items]                
Change in estimated fair values for liabilities acquired       60.2        
Change in estimated fair values for assets acquired       $ 40.0        
Goodwill   $ 5,804.4            
GE Transportation                
Business Acquisition [Line Items]                
Revenues           2,570.0    
Operating income           196.7    
Acquisition related costs           $ 58.4    
Cash payment for business acquisition   $ 470.0            
Annax                
Business Acquisition [Line Items]                
Acquisitions of businesses, net of cash acquired     $ 45.2          
Goodwill     38.5          
Cash payment for business acquisition         $ 10.1      
Acquired indefinite-lived intangible assets     11.7          
Annax | Customer relationships                
Business Acquisition [Line Items]                
Acquired indefinite-lived intangible assets     7.5          
Intangible assets, weighted average useful life (years) 20 years              
Annax | Trade Names                
Business Acquisition [Line Items]                
Acquired indefinite-lived intangible assets     $ 3.8