Increase (decrease) in carrying amount of medium-term notes due to mark-to-market adjustments on interest rate swaps.

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- Definition

Deferred Gain Loss On Discontinuation of Interest Rate Fair Value Hedge, Inception

+ Details

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- Definition

Effect of interest rate swaps change in interest expense.

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- Definition

Notional Amount of Interest Rate Fair Value Hedge, Terminated during period.

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- Definition

Original Maturity of Interest Rate Swaps Terminated, Date Range Begin

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Original Maturity of Interest Rate Swaps Terminated, Date Range End

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- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 24

-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 815

-SubTopic 25

-Section 35

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6439857&loc=d3e75592-113984

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Debt (Interest Rate Swaps) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
Debt (Interest Rate Swaps) (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Notional Amount of Interest Rate Fair Value Hedge, Terminated	$ 750.0
Original Maturity of Interest Rate Swaps Terminated, Date Range	Mar. 01, 2012
Original Maturity of Interest Rate Swaps Terminated, Date Range End	Apr. 01, 2013
Deferred Gain Loss On Discontinuation of Interest Rate Fair Value Hedge, Inception	22.7
Mark-to-market adjustments	35.4		35.4		42.3
Reduction of interest expense	7.6	8.5	24.1	24.3
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	20.2		20.2
Interest Rate Swaps [Member]
Principal amount of note	$ 250.0		$ 250.0