Note 4 - Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 06, 2014
Senior Notes First Issuance [Member] \| Senior Notes [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Unsecured Debt	$ 100
Debt Instrument, Interest Rate, Stated Percentage	6.08%
Senior Notes Second Issuance [Member] \| Senior Notes [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Unsecured Debt	250
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Senior Notes Third Issuance [Member] \| Senior Notes [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Unsecured Debt	250	250
Debt Instrument, Interest Rate, Stated Percentage	2.40%	2.40%
Senior Notes Fourth Issuance [Member] \| Senior Notes [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Unsecured Debt	250
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Line of Credit [Member] \| Senior Debt Obligations [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500
Senior Debt Obligations [Member]
Note 4 - Financing Arrangements (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity, Increase	$ 250

Optional increase in the 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.

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the 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))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant