Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,624.3	$ 1,633.8
Accumulated amortization	(1,036.7)	(1,000.6)
Net	587.6	633.2
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	1,112.3	1,119.2
Accumulated amortization	(695.4)	(677.2)
Net	416.9	442.0
Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Gross	472.0	474.7
Accumulated amortization	(333.8)	(321.1)
Net	138.2	153.6
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	40.0	39.9
Accumulated amortization	(7.5)	(2.3)
Net	$ 32.5	$ 37.6

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

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