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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 1,320.2 | $ 1,345.1
Accumulated Amortization | (1,000.1) | (980.7)
Net | 320.1 | 364.4
Permits and leasehold agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 876.0 | 880.6
Accumulated Amortization | (681.0) | (659.0)
Net | 195.0 | 221.6
Franchise agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 442.1 | 462.4
Accumulated Amortization | (317.9) | (320.7)
Net | 124.2 | 141.7
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 2.1 | 2.1
Accumulated Amortization | (1.2) | (1.0)
Net | $ 0.9 | $ 1.1

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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