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Goodwill And Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Goodwill	1,321.7us-gaap_Goodwill	$ 1,314.7us-gaap_Goodwill
Franchise rights - indefinite-lived	362.8us-gaap_IndefiniteLivedFranchiseRights	348.1us-gaap_IndefiniteLivedFranchiseRights
Other intangibles	12.6us-gaap_FiniteLivedIntangibleAssetsGross	12.6us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets, gross	375.4us-gaap_IntangibleAssetsGrossExcludingGoodwill	360.7us-gaap_IntangibleAssetsGrossExcludingGoodwill
Less: accumulated amortization	(6.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(6.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Other intangible assets, net	369.2us-gaap_IntangibleAssetsNetExcludingGoodwill	$ 354.7us-gaap_IntangibleAssetsNetExcludingGoodwill
Franchise Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Date of annual goodwill and indefinite lived intangible assets impairment test	April 30
Goodwill [Member]
Indefinite-lived Intangible Assets [Line Items]
Date of annual goodwill and indefinite lived intangible assets impairment test	April 30

X

- Definition

The date of the annual goodwill and indefinite-lived franchise rights impairment test.

+ References

No definition available.

+ Details

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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/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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X

- 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

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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X

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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X

- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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