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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,846.0	$ 1,836.7
Accumulated amortization	(1,236.5)	(1,221.8)
Intangible assets	609.5	614.9
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	1,311.8	1,303.6
Accumulated amortization	(828.3)	(816.5)
Intangible assets	483.5	487.1
Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Gross	529.3	528.2
Accumulated amortization	(405.4)	(402.7)
Intangible assets	123.9	125.5
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	4.9	4.9
Accumulated amortization	(2.8)	(2.6)
Intangible assets	$ 2.1	$ 2.3

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.

+ References

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

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-Name Accounting Standards Codification
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