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Acquisition - Purchase Price and Related Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 17, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 1,655.8 $ 1,614.3 $ 1,405.3
Xevo Inc.        
Business Acquisition [Line Items]        
Net purchase price $ 321.7 321.7 321.7  
Other assets purchased and liabilities assumed, net   12.1 9.5  
Goodwill   219.5 219.0  
Intangible assets   90.1 93.2  
Purchase price allocation   321.7 $ 321.7  
Adjustments        
Net purchase price   0.0    
Other assets purchased and liabilities assumed, net   2.6    
Goodwill   0.5    
Intangible assets   (3.1)    
Purchase price allocation   $ 0.0