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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,846.0 | $ 1,836.7
Accumulated amortization | (1,236.5) | (1,221.8)
Intangible assets | 609.5 | 614.9
Permits and leasehold agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,311.8 | 1,303.6
Accumulated amortization | (828.3) | (816.5)
Intangible assets | 483.5 | 487.1
Franchise agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 529.3 | 528.2
Accumulated amortization | (405.4) | (402.7)
Intangible assets | 123.9 | 125.5
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 4.9 | 4.9
Accumulated amortization | (2.8) | (2.6)
Intangible assets | $ 2.1 | $ 2.3

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