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Acquisitions - Narrative (Details)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Displays
Jun. 30, 2019
USD ($)
Displays
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Displays
Business Acquisition [Line Items]        
Noncash or part noncash acquisition, value of assets acquired   $ 29.4 $ 4.3  
Payments to acquire businesses, net of cash acquired   (34.4) $ (4.3)  
Acquired businesses        
Business Acquisition [Line Items]        
Noncash or part noncash acquisition, value of assets acquired   $ 35.4    
Acquired businesses | Subsequent Event        
Business Acquisition [Line Items]        
Noncash or part noncash acquisition, value of assets acquired $ 9.2      
Acquired businesses | Digital displays        
Business Acquisition [Line Items]        
Number of displays | Displays   14    
Acquired businesses | Digital displays | Subsequent Event        
Business Acquisition [Line Items]        
Number of displays | Displays 4     4
Acquired businesses | Static displays        
Business Acquisition [Line Items]        
Number of displays | Displays   7    
Acquired businesses other        
Business Acquisition [Line Items]        
Deposit for pending acquisition   $ 5.0    
Acquired businesses other | Subsequent Event        
Business Acquisition [Line Items]        
Noncash or part noncash acquisition, value of assets acquired       $ 24.0
Acquired businesses other | Digital displays | Subsequent Event        
Business Acquisition [Line Items]        
Number of displays | Displays 4     4