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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

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