Debt (Details Textual)	6 Months Ended
Jun. 30, 2012 USD ($)	Jun. 30, 2012 JPY (¥)	May 24, 2012 JPY (¥)	Jun. 30, 2012 Term Loan [Member] USD ($)
Debt Instrument [Line Items]
Estimated fair value of Senior Notes	$ 1,742,600,000			$ 145,600,000
Interest rate on term loan	4.625%	4.625%		0.61%
Debt (Textual) [Abstract]
Senior credit facility	1,350,000,000
Senior credit facility, maturity date	May 09, 2017	May 09, 2017
Line of credit facility expiration date of previous credit facility	Nov. 30, 2012	Nov. 30, 2012
Borrowings outstanding under the previous credit facility converted to the Senior Credit Facility			11,700,000,000
Term loan	$ 145,400,000	¥ 11,700,000,000
Maturity date of term loan	May 31, 2016	May 31, 2016

Interest rate stated in the contractual debt agreement.

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

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

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- Definition

Amount borrowed under the credit facility 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 19, 22

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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

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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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

The fair value amount of long-term debt 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.

+ References

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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- Definition

Line of credit facility expiration date of previous credit facility.

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No definition available.

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- Definition

Maturity date of term loan.

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No definition available.

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