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Commitment and Contingencies MTA Agreement Schedule (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Change In MTA Deployment Costs [Roll Forward]      
Prepaid MTA equipment deployment costs, beginning of period $ 0.0 $ 363.2 $ 363.2
Other current assets, beginning of period 15.7    
Intangible assets, gross, beginning of period 2,489.8    
MTA deployment costs, beginning of period 1.1 426.8 426.8
MTA equipment development cost additions 9.1   43.7
Total recoupment and MTA funding     (0.1)
Increase (Decrease) reclassification to (from) Prepaid MTA equipment deployment costs 0.0 18.8  
Prepaid MTA equipment deployment costs, end of period     0.0
Intangible assets, gross, end of period 2,503.6   2,489.8
Other current assets, end of period 14.4   15.7
MTA deployment costs, end of period 1.1   1.1
MTA equipment deployment costs      
Change In MTA Deployment Costs [Roll Forward]      
Other current assets, beginning of period 1.1 1.6 1.6
Deployment costs incurred     21.8
Other current assets 0.0   (0.4)
Amortization and impairment of intangible assets (9.1)   (469.3)
Other current assets, end of period 1.1   1.1
MTA equipment deployment costs | Reclassification, Other      
Change In MTA Deployment Costs [Roll Forward]      
Increase (Decrease) reclassification to (from) Prepaid MTA equipment deployment costs     (385.0)
Increase (Decrease) reclassification to (from) intangible assets     385.0
MTA Funding      
Change In MTA Deployment Costs [Roll Forward]      
Other current assets     (0.1)
Franchise agreements      
Change In MTA Deployment Costs [Roll Forward]      
Intangible assets, gross, beginning of period 934.8    
Intangible assets, gross, end of period 944.0   934.8
Franchise agreements | MTA equipment deployment costs      
Change In MTA Deployment Costs [Roll Forward]      
Intangible assets, gross, beginning of period 0.0 $ 62.0 62.0
Intangible asset additions 9.1   22.3
Amortization and impairment of intangible assets (9.1)   (469.3)
Intangible assets, gross, end of period $ 0.0   $ 0.0