v2.4.0.6

Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt
Principal amount of debt	$ 7,092.2	$ 7,048.4
Debt Instrument, Discount	(170.4)	(304.8)
Debt	6,921.8	6,743.6
Less: Current portion	(34.8)	(878.5)
Long-term portion	6,887.0	5,865.1
Long term debt, credit facility matured on April 2012 [Member]
Debt
Line of Credit Facility, Interest Rate Variable	Variable
Principal amount of debt	0	25.0
Debt Instrument, Discount	0	0
Debt	0	25.0
Long term debt, credit facility matured on September 2013 [Member]
Debt
Line of Credit Facility, Interest Rate Variable	Variable%
Principal amount of debt	17.2	50.0
Debt Instrument, Discount	0	0
Debt	17.2	50.0
$1.0 billion Revolver due 2012 [Member]
Debt
Line of Credit Facility, Interest Rate Variable	Variable
Principal amount of debt	17.2	0
Debt Instrument, Discount	0	0
Debt	17.2	0
Long term debt, senior note matured on February 2011 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	5.75%
Principal amount of debt	0	262.9
Debt Instrument, Discount	0	(1.2)
Debt	0	261.7
Long term debt, senior note matured on April 2011 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	6.375%
Principal amount of debt	0	216.9
Debt Instrument, Discount	0	(1.8)
Debt	0	215.1
Long term debt, senior note matured on August 2011 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	6.75%
Principal amount of debt	0	392.2
Debt Instrument, Discount	0	(0.2)
Debt	0	392.0
Long term debt, senior note matured on May 2016 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	7.125%
Principal amount of debt	0	600.0
Debt Instrument, Discount	0	(64.5)
Debt	0	535.5
Long term debt, senior note matured on June 2017 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	6.875%
Principal amount of debt	750.0	750.0
Debt Instrument, Discount	(75.8)	(86.1)
Debt	674.2	663.9
Long term debt, senior note matured on May 2018 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	3.80%
Principal amount of debt	700.0	0
Debt Instrument, Discount	(0.2)	0
Debt	699.8	0
Long term debt, senior note matured on September 2019 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	5.50%
Principal amount of debt	650.0	650.0
Debt Instrument, Discount	(3.8)	(4.2)
Debt	646.2	645.8
Long term debt, senior note matured on March 2020 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	5.00%
Principal amount of debt	850.0	850.0
Debt Instrument, Discount	(0.1)	(0.1)
Debt	849.9	849.9
Long term debt, senior note matured on November 2021 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	5.25%
Principal amount of debt	600.0	600.0
Debt Instrument, Discount	0	0
Debt	600.0	600.0
Long term debt, senior note matured on May 2023 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	4.75%
Principal amount of debt	550.0	0
Debt Instrument, Discount	(1.4)	0
Debt	548.6	0
Long term debt, senior note matured on March 2035 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	6.086%
Principal amount of debt	275.7	275.6
Debt Instrument, Discount	(25.5)	(25.8)
Debt	250.2	249.8
Long term debt, senior note matured on March 2040 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	6.20%
Principal amount of debt	650.0	650.0
Debt Instrument, Discount	(0.5)	(0.5)
Debt	649.5	649.5
Long term debt, senior note matured on May 2041 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	5.70%
Principal amount of debt	600.0	0
Debt Instrument, Discount	(3.4)	0
Debt	596.6	0
Long term debt, debentures matured on May 2021 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	9.25%
Principal amount of debt	35.3	99.5
Debt Instrument, Discount	(2.0)	(6.1)
Debt	33.3	93.4
Long term debt, debentures matured on September 2035 [Member]
Debt
Debt Instrument, Interest Rate, Percentage	7.40%
Principal amount of debt	165.2	360.0
Debt Instrument, Discount	(41.9)	(92.4)
Debt	123.3	267.6
Tax-exempt bonds and other tax-exempt financings; maturities ranging from 2012 to 2035 [Member]
Debt
Interest rate, minimum	0.06%
Interest rate, maximum	8.25%
Principal amount of debt	1,142.2	1,173.7
Debt Instrument, Discount	(15.8)	(21.9)
Debt	1,126.4	1,151.8
Other debt unsecured and secured by real property, equipment and other assets; interest rate maturing ranging from 2012 to 2042 [Member]
Debt
Interest rate, minimum	5.00%
Interest rate, maximum	11.90%
Principal amount of debt	89.4	92.6
Debt Instrument, Discount	0	0
Debt	$ 89.4	$ 92.6

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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 835

-SubTopic 30

-Section 45

-Paragraph 2

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X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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- Definition

When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399



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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-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 835

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 20

-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.

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X

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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- Definition

Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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