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Acquisitions and Divestitures - Narrative (Details)
$ in Millions
12 Months Ended
Oct. 09, 2019
USD ($)
Sep. 13, 2019
USD ($)
country
Dec. 12, 2018
USD ($)
Sep. 11, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]                
Goodwill         $ 1,092.1 $ 1,157.8 $ 1,139.5  
Loss on divestiture         $ 0.0 $ (0.1) 0.0  
Tritium                
Business Acquisition [Line Items]                
Number of countries with installations | country   38            
ACIS | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Business Acquisition [Line Items]                
Proceeds from divestiture $ 1.7              
Loss on divestiture $ (0.1)              
Tritium                
Business Acquisition [Line Items]                
Payments to acquire minority interest       $ 44.9        
Payment to acquire additional interest in investment   $ 4.1            
Midco                
Business Acquisition [Line Items]                
Total purchase price     $ 35.9       35.9  
Revenue of prior fiscal year               $ 37.0
Goodwill     $ 29.4       $ 29.4