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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,668.4 | $ 1,625.0
Accumulated amortization | (1,117.2) | (1,087.8)
Intangible assets | 551.2 | 537.2
Permits and leasehold agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 1,137.6 | 1,107.4
Accumulated amortization | (716.2) | (697.6)
Intangible assets | 421.4 | 409.8
Franchise agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 483.8 | 470.7
Accumulated amortization | (364.0) | (357.1)
Intangible assets | 119.8 | 113.6
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 47.0 | 46.9
Accumulated amortization | (37.0) | (33.1)
Intangible assets | $ 10.0 | $ 13.8

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