Stock Based Compensation (Details 1) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011 Years Segments RetirementPlans Employees Claims CubicYards Landfills
Stock option activity
Number of Shares, Outstanding, Beginning Balance	13.6
Number of Shares, Granted	2.9
Number of Shares, Exercised	(1.3)
Number of Share, Forfeited or expired	(0.2)
Number of Shares, Outstanding, Ending Balance	15.0
Number of Shares, Exercisable	8.3
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance	$ 24.97
Weighted Average Exercise Price per Share, Granted	$ 29.87
Weighted Average Exercise Price per Share, Exercised	$ 22.73
Weighted Average Exercise Price per Share, Forfeited or expired	$ 30.35
Weighted Average Exercise Price per Share, Outstanding, Ending Balance	$ 26.04
Weighted Average Exercise Price per Share, Exercisable	$ 24.90
Weighted Average Remaining Contractual Term (years), Outstanding	4.6
Weighted Average Remaining Contractual Term (years), Exercisable	3.8
Aggregate Intrinsic Value, Exercised	$ 11.6
Aggregate Intrinsic Value, Outstanding	72.4
Aggregate Intrinsic Value, Exercisable	$ 49.8

Summary of stock option activity.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options that are exercisable.

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Number of share options (or share units) exercised during the current period.

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