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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

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