v2.4.0.6

Segment Reporting (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 Segment | Dec. 31, 2010 | Dec. 31, 2009
Segment Information (Textual) |  |  |
Number of reportable segments | 4 |  |
Net decrease/increase in amortization expense related to changes in estimates and assumptions concerning the cost and timing of future final capping, closure and post - closure activities | $ 9.6 | $ 10.2 | $ 5.1
Loss from disposition of assets included in operating income | 43.0 | 11.2 | 147.1
Asset impairments | 49.1 | 15.1 | 7.1
Impairment loss of long lived assets | 20.4 | 15.1 | 7.1
Eastern [Member] |  |  |
Segment Information (Textual) |  |  |
Loss from disposition of assets included in operating income | 0.6 | 15.0 | 4.0
Assets impairment expense related to assets held for sale | 12.8 |  |
Insurance proceeds to remediation costs | 12.0 |  |
Midwestern [Member] |  |  |
Segment Information (Textual) |  |  |
Loss from disposition of assets included in operating income |  | 9.3 | 27.1
Southern [Member] |  |  |
Segment Information (Textual) |  |  |
Loss from disposition of assets included in operating income | 17.2 |  | 29.8
Asset impairments | 28.7 |  |
Western [Member] |  |  |
Segment Information (Textual) |  |  |
Loss from disposition of assets included in operating income | 1.8 |  | 88.1
Asset impairments | 7.0 |  |
Operating income for environmental conditions at closed disposal facility | 5.2 |  |
Corporate entities [Member] |  |  |
Segment Information (Textual) |  |  |
Loss from disposition of assets included in operating income |  |  | 8.2
Asset impairments |  |  | 3.7
Impairment loss of long lived assets |  | $ 14.4 |

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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -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 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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