Debt and Credit Arrangements [Abstract]

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- Definition

The gain (loss) on the termination of interest rate swaps related to senior unsecured notes, which will be amortized as a reduction to interest expense over the remaining term of the notes.

+ Details

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- Definition

The annual effective interest rate of a terminated interest rate swap.

+ Details

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- Definition

Reflects when the credit facility was most recently amended, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ Details

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- Definition

Maximum borrowing capacity, prior to the most recent amendment, under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ Details

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- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Reflects when the credit facility first became available, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
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- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

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- Definition

The cash inflow provided by derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 23
-Name Accounting Standards Codification
-Publisher FASB
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3505-108585

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Credit Facility and Interest Rate Swap (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	May 31, 2011	Jun. 30, 2011	Apr. 30, 2011	Mar. 31, 2011
Debt and Credit Arrangements [Abstract]
Credit Agreement amendment date		May 31, 2011
Credit Agreement original agreement date		July 18, 2008
Credit Agreement expiration date		May 31, 2016
Credit Agreement current borrowing capacity	$ 1,000.0
Credit Agreement borrowing capacity prior to amendment	650.0
Notional amount of interest rate swap			100.0	100.0
Proceeds at termination of derivative instrument	2.7
Debt premium adjustment upon termination of swap	$ 2.3
Effective interest rate of debt	5.80%