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Landfill and Environmental Costs (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 Landfills CubicYards | Dec. 31, 2010 | Dec. 31, 2009
Environmental Exit Cost [Line Items] |  |  |
Remediation liability | $ 543.7 | $ 552.1 | $ 554.1
Summary of landfill and environmental liabilities |  |  |
Landfill final capping, closure and post-closure liabilities | 1,037.0 | 1,046.5 | 1,074.5
Remediation | 543.7 | 552.1 | 554.1
Landfill and environmental liabilities | 1,580.7 | 1,598.6 |
Less: Current portion | (184.2) | (182.0) |
Long-term portion | 1,396.5 | 1,416.6 |
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure |  |  |
Asset retirement obligation liabilities, beginning of year | 1,046.5 | 1,074.5 | 1,040.6
Non-cash additions | 33.9 | 31.4 | 32.5
Acquisitions and other adjustments | 15.8 | (3.0) | 72.3
Asset retirement obligation adjustments | (31.5) | (27.9) | (57.4)
Payments | (105.7) | (111.3) | (100.9)
Accretion expense | 78.0 | 80.5 | 88.8
Adjustments to liabilities related to assets held for sale |  | 2.3 | (1.4)
Asset retirement obligation liabilities, end of period | 1,037.0 | 1,046.5 | 1,074.5
Less: Current portion | (85.2) | (93.9) | (137.5)
Long-term portion | 951.8 | 952.6 | 937.0
Summary of expected future payments for final capping, closure and post-closure |  |  |
2012 | 85.2 |  |
2013 | 111.0 |  |
2014 | 97.0 |  |
2015 | 98.7 |  |
2016 | 94.3 |  |
Thereafter | 4,628.9 |  |
Total | 5,115.1 |  |
Activity in environmental remediation liabilities |  |  |
Remediation liabilities, beginning of year | 552.1 | 554.1 | 389.9
Acquisitions and other adjustments |  | 1.5 | 181.9
Additions charged to expense | 3.6 | 17.9 | 4.9
Payments | (45.0) | (50.5) | (56.2)
Accretion expense (non-cash interest expense) | 33.0 | 29.1 | 33.6
Remediation liabilities, end of period | 543.7 | 552.1 | 554.1
Less: Current portion | (99.0) | (88.1) | (107.9)
Long-term portion | 444.7 | 464.0 | 446.2
Summary of expected undiscounted future payments for remediation costs |  |  |
2012 | 99.0 |  |
2013 | 64.3 |  |
2014 | 45.7 |  |
2015 | 37.7 |  |
2016 | 32.6 |  |
Thereafter | 458.7 |  |
Total | 738.0 |  |
Landfill and Environmental Costs (Textual) |  |  |
Number of active solid waste landfills | 191 |  |
Total available disposal capacity (billion in-place cubic yards) | 4,800,000,000 |  |
Number of closed landfills | 130 |  |
Closure and post-closure reserve fair value, increase |  |  | 72.3
Closure and post-closure obligations, risk free rate | 9.75% |  | 9.75%
Net Increase (Decrease) in amortization expense | 9.6 | 10.2 | 5.1
Fair value of assets that are legally restricted for final capping, closure and post-closure obligations | 54.9 |  |
Amount of aggregate potential remediation liability | 197 |  |
Aggregate potential remediation liability | If we used the reasonably possible high ends of our ranges, our aggregate potential remediation liability at December 31, 2011 would be approximately $197 million higher than the amounts recorded. |  |
Allied [Member] |  |  |
Environmental Exit Cost [Line Items] |  |  |
Remediation reserve | 181.9 |  |
Countywide Landfill [Member] |  |  |
Environmental Exit Cost [Line Items] |  |  |
Remediation liability | 56.8 |  |
Expected remediation liability to be paid during the remainder of the current year | 5.0 |  |
Range of loss for remediation costs (minimum) | 53 |  |
Range of loss for remediation costs (maximum) | 74 |  |
Summary of landfill and environmental liabilities |  |  |
Remediation | 56.8 |  |
Activity in environmental remediation liabilities |  |  |
Remediation liabilities, end of period | 56.8 |  |
Congress Landfill [Member] |  |  |
Environmental Exit Cost [Line Items] |  |  |
Remediation liability | 83.6 |  |
Expected remediation liability to be paid during the remainder of the current year | 7.4 |  |
Range of loss for remediation costs (minimum) | 53 |  |
Range of loss for remediation costs (maximum) | 154 |  |
Summary of landfill and environmental liabilities |  |  |
Remediation | 83.6 |  |
Activity in environmental remediation liabilities |  |  |
Remediation liabilities, end of period | $ 83.6 |  |

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