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Commitment and Contingencies MTA Agreement Schedule (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 21 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Mar. 31, 2022
Change In MTA Deployment Costs [Roll Forward]        
Prepaid MTA equipment deployment costs, beginning of period $ 279.8 $ 204.6 $ 204.6  
Other current assets, beginning of period 11.7      
Intangible assets, gross, beginning of period 1,836.7      
MTA deployment costs, beginning of period 348.0 291.0 291.0  
Amortization 14.8 16.4    
MTA equipment development cost additions 16.9   95.9  
Total recoupment and MTA funding (3.1)   (29.0)  
Prepaid MTA equipment deployment costs, end of period 295.2   279.8 $ 295.2
Intangible assets, gross, end of period 1,846.0   1,836.7 1,846.0
Other current assets, end of period 11.2   11.7 11.2
MTA deployment costs, end of period 361.2   348.0 361.2
MTA equipment deployment costs        
Change In MTA Deployment Costs [Roll Forward]        
Other current assets, beginning of period 5.2 28.0 28.0  
Deployment costs incurred 15.4   75.2  
Other current assets 0.1   6.2  
Amortization (0.6)   (9.9)  
Other current assets, end of period 2.2   5.2 2.2
MTA Funding        
Change In MTA Deployment Costs [Roll Forward]        
Other current assets (3.1)   (29.0) (48.5)
Franchise agreements        
Change In MTA Deployment Costs [Roll Forward]        
Intangible assets, gross, beginning of period 528.2      
Intangible assets, gross, end of period 529.3   528.2 529.3
Franchise agreements | MTA equipment deployment costs        
Change In MTA Deployment Costs [Roll Forward]        
Intangible assets, gross, beginning of period 63.0 $ 58.4 58.4  
Intangible asset additions 1.4   14.5  
Amortization (0.6)   (9.9)  
Intangible assets, gross, end of period $ 63.8   $ 63.0 $ 63.8