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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,680.7 | $ 1,625.0
Accumulated amortization | (1,132.1) | (1,087.8)
Intangible assets | 548.6 | 537.2
Permits and leasehold agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,144.6 | 1,107.4
Accumulated amortization | (725.7) | (697.6)
Intangible assets | 418.9 | 409.8
Franchise agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 489.1 | 470.7
Accumulated amortization | (367.6) | (357.1)
Intangible assets | 121.5 | 113.6
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 47.0 | 46.9
Accumulated amortization | (38.8) | (33.1)
Intangible assets | $ 8.2 | $ 13.8

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