v2.4.0.6

Financial Instruments (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Money market mutual funds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	$ 100.8	$ 135.7
Bonds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	34.6	27.2
Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	138.4	171.6
Liabilities:
Liabilities	5.4	8.4
Quoted Prices in Active Markets (Level 1) [Member] | Money market mutual funds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	100.8	135.7
Quoted Prices in Active Markets (Level 1) [Member] | Bonds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	0	0
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	100.8	135.7
Liabilities:
Liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Money market mutual funds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) [Member] | Bonds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	34.6	27.2
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	37.6	35.9
Liabilities:
Liabilities	5.4	8.4
Significant Unobservable Inputs (Level 3) [Member] | Money market mutual funds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) [Member] | Bonds [Member]
Assets:
Available-for-sale Securities, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	0	0
Liabilities:
Liabilities	0	0
Recycling Commodity Hedges [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	1.4	1.9
Liabilities:
Hedges	0.7	6.5
Recycling Commodity Hedges [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	0	0
Liabilities:
Hedges	0	0
Recycling Commodity Hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	1.4	1.9
Liabilities:
Hedges	0.7	6.5
Recycling Commodity Hedges [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	0	0
Liabilities:
Hedges	0	0
Interest rate swaps - other non-trade receivables [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis		5.2
Interest rate swaps - other non-trade receivables [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis		0
Interest rate swaps - other non-trade receivables [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis		5.2
Interest rate swaps - other non-trade receivables [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis		0
Fuel hedges [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	1.6	1.6
Liabilities:
Hedges	4.7	1.9
Fuel hedges [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	0	0
Liabilities:
Hedges	0	0
Fuel hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	1.6	1.6
Liabilities:
Hedges	4.7	1.9
Fuel hedges [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Assets, at fair value on a recurring basis	0	0
Liabilities:
Hedges	$ 0	$ 0

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-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 815

-SubTopic 10

-Section 45

-Paragraph 5

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4, 17

-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 10

-Subparagraph i

-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 133

-Paragraph 6

-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 815

-SubTopic 10

-Section 15

-Paragraph 83

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- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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