Goodwill and Other Intangible Assets, Net (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Summary of the activity and balances by intangible asset type
Gross Intangible Assets, Beginning Balance	$ 642.9	$ 621.4
Acquisitions	33.1	21.5
Gross Intangible Assets, Ending Balance	676.0	642.9
Accumulated Amortization, Beginning Balance	(191.6)	(121.4)
Additions Charged to Expense	(74.8)	(70.5)
Adjustments to Acquisitions		0.3
Accumulated Amortization, Ending Balance	(266.4)	(191.6)
Net Intangibles	409.6	451.3
Customer relationships, franchise and other municipal agreements [Member]
Summary of the activity and balances by intangible asset type
Gross Intangible Assets, Beginning Balance	537.1	521.1
Acquisitions	29.1	16.0
Gross Intangible Assets, Ending Balance	566.2	537.1
Accumulated Amortization, Beginning Balance	(130.7)	(70.5)
Additions Charged to Expense	(63.7)	(60.2)
Accumulated Amortization, Ending Balance	(194.4)	(130.7)
Net Intangibles	371.8	406.4
Trade names [Member]
Summary of the activity and balances by intangible asset type
Gross Intangible Assets, Beginning Balance	30.0	30.0
Gross Intangible Assets, Ending Balance	30.0	30.0
Accumulated Amortization, Beginning Balance	(12.5)	(6.5)
Additions Charged to Expense	(6.0)	(6.0)
Accumulated Amortization, Ending Balance	(18.5)	(12.5)
Net Intangibles	11.5	17.5
Non-compete Agreements [Member]
Summary of the activity and balances by intangible asset type
Gross Intangible Assets, Beginning Balance	12.9	7.4
Acquisitions	4.0	5.5
Gross Intangible Assets, Ending Balance	16.9	12.9
Accumulated Amortization, Beginning Balance	(7.2)	(6.5)
Additions Charged to Expense	(2.1)	(1.0)
Adjustments to Acquisitions		0.3
Accumulated Amortization, Ending Balance	(9.3)	(7.2)
Net Intangibles	7.6	5.7
Other intangibles assets [Member]
Summary of the activity and balances by intangible asset type
Gross Intangible Assets, Beginning Balance	62.9	62.9
Gross Intangible Assets, Ending Balance	62.9	62.9
Accumulated Amortization, Beginning Balance	(41.2)	(37.9)
Additions Charged to Expense	(3.0)	(3.3)
Accumulated Amortization, Ending Balance	(44.2)	(41.2)
Net Intangibles	$ 18.7	$ 21.7

Finite lived intangible assets accumulated amortization adjustment to acquisition.

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- Definition

Finite Lived Intangible Assets Acquired During Period.

+ References

No definition available.

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- Definition

Finite-lived intangible assets reduction due to amortization.

+ References

No definition available.

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- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-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 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)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

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- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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