Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,636.1	$ 1,633.8
Accumulated amortization	(1,029.3)	(1,000.6)
Net	606.8	633.2
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	1,122.4	1,119.2
Accumulated amortization	(693.0)	(677.2)
Net	429.4	442.0
Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Gross	473.7	474.7
Accumulated amortization	(330.5)	(321.1)
Net	143.2	153.6
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	40.0	39.9
Accumulated amortization	(5.8)	(2.3)
Net	$ 34.2	$ 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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