Stock Based Compensation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011 Years Segments RetirementPlans Employees Claims CubicYards Landfills
Restricted stock unit and restricted stock activity
Number of Restricted Stock Units and Shares of Restricted Stock, Unissued, Beginning Balance	849,300
Number of Restricted Stock Units and Shares of Restricted Stock, Granted	169,400
Number of Restricted Stock Units and Shares of Restricted Stock, Vested and Issued	(134,800)
Number of Restricted Stock Units and Shares of Restricted Stock, Forfeited	(8,100)
Number of Restricted Stock Units and Shares of Restricted Stock, Unissued, Ending Balance	875,800
Number of Restricted Stock Units and Shares of Restricted Stock, Vested and Unissued	477,800
Weighted-Average Grant Date Fair Value per Share, Unissued, Beginning Balance	$ 26.39
Weighted-Average Grant Date Fair Value per Share, Granted	$ 30.02
Weighted-Average Grant Date Fair Value per Share, Vested and Issued	$ 25.74
Weighted-Average Grant Date Fair Value per Share, Forfeited	$ 24.97
Weighted-Average Grant Date Fair Value per Share, Unissued, Ending Balance	$ 27.21
Weighted-Average Grant Date Fair Value per Share, Vested and Unissued	$ 27.21
Weighted-Average Remaining Contractual Term (years), Unissued	0.6
Aggregate Intrinsic Value, Unissued	$ 27.0

Share based Payment Award Equity Instruments Other than Options Aggregate Intrinsic Value.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Options Unissued Weighted Average Grant Date Fair Value

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Unissued Number

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And issued.

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Share Based Payment Award Equity Instruments Other Than Options Vested And Unissued Weighted Average Grant Date Fair Value.

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Summarizes Restricted Stock Unit and Restricted Stock Activity.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(c)
-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 Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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-Topic 718
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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