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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
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

X

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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