Goodwill And Intangible Assets (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Franchise Rights [Member]	Jun. 30, 2013 Goodwill [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 1,253.0	$ 1,237.4
Franchise rights - indefinite-lived	322.5	285.7
Other intangibles	10.6	9.9
Intangible Assets Gross (Excluding Goodwill)	333.1	295.6
Less: accumulated amortization	(4.9)	(4.3)
Other intangible assets, net	$ 328.2	$ 291.3
Date of annual goodwill and indefinite lived intangible assets impairment test			April 30	April 30

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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