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Commitment and Contingencies MTA Agreement Schedule (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Change In MTA Deployment Costs [Roll Forward]          
Prepaid MTA equipment deployment costs, beginning of period     $ 79.5 $ 4.7 $ 4.7
Intangible assets, gross, beginning of period     1,625.0    
MTA deployment costs, beginning of period     94.3 5.6 5.6
Amortization of intangible assets $ 27.6 $ 25.0 52.3 47.5  
MTA equipment development cost additions     71.1   91.2
Prepaid MTA equipment deployment costs, end of period 125.7   125.7   79.5
Intangible assets, gross, end of period 1,668.4   1,668.4   1,625.0
MTA deployment costs, end of period 151.8   151.8   94.3
MTA equipment deployment costs          
Change In MTA Deployment Costs [Roll Forward]          
Dployment costs incurred     58.6   76.5
Recoupment     (12.4)   (1.7)
Amortization of intangible assets     (1.2)   (0.8)
Franchise agreements          
Change In MTA Deployment Costs [Roll Forward]          
Intangible assets, gross, beginning of period     470.7    
Intangible assets, gross, end of period 483.8   483.8   470.7
Franchise agreements | MTA equipment deployment costs          
Change In MTA Deployment Costs [Roll Forward]          
Intangible assets, gross, beginning of period     14.8 $ 0.9 0.9
Intangible asset additions     12.5   14.7
Amortization of intangible assets     (1.2)   (0.8)
Intangible assets, gross, end of period $ 26.1   $ 26.1   $ 14.8