2.2.0.7 true Financing Arrangements (Details) (USD $) 0610 - Disclosure - Financing Arrangements (Details) true false false false 1 USD false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 3 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD true false false false 3.6% senior notes due 2021 us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi gr_SeniorNoteOneMember us-gaap_LongtermDebtTypeAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false 7.625% senior notes due 2012 us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi gr_SeniorNoteTwoMember us-gaap_LongtermDebtTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 6 USD true false false false 7.625% senior notes due 2012 us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi gr_SeniorNoteTwoMember us-gaap_LongtermDebtTypeAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ 5 Financing Arrangements Contract [Details] 3 gr_FinancingArrangementsContractDetails gr false na duration Financing Arrangements Contract Details false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:stringItemType string Financing Arrangements Contract Details false 6 Interst rate on senior note 4 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false 0.036 0.036 true false false 5 false false false false 0 0 true false false 6 false true false false 0.07625 0.07625 true false false us-types:percentItemType pure 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 false 7 Amortized discount 4 us-gaap_DebtInstrumentUnamortizedDiscount us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 true true false false 1300000 1300000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 8 Redemption of outstanding principal amount 4 us-gaap_DebtInstrumentDecreaseRepayments us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 257460000 257460000 true false false xbrli:monetaryItemType monetary Decrease for amounts repaid on the debt instrument for the period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 false 10 Premium on senior notes 4 us-gaap_DebtInstrumentUnamortizedPremium us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 37400000 37400000 true false false xbrli:monetaryItemType monetary The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 11 Gain for terminated interest rate swaps 4 gr_GainForTerminatedInterestRateSwaps gr false credit duration Gain for terminated interest rate swaps. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 2500000 2500000 true false false xbrli:monetaryItemType monetary Gain for terminated interest rate swaps. No authoritative reference available. false 12 Financing Arrangements (Textuals) [Abstract] 1 gr_FinancingArrangementsTextualsAbstract gr false na duration Financing Arrangements. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:stringItemType string Financing Arrangements. false 13 Global syndicated revolving credit facility 2 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 500000000 500000000 false false false 2 false true false false 500000000 500000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary 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. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 15 Borrowings under credit facility 2 us-gaap_ProceedsFromLongTermLinesOfCredit us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 0 0 false false false 3 false true false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 16 Income retained in business and additional paid in capital free from borrowing compliance covenants 2 gr_IncomeRetainedInBusinessAndAdditionalPaidInCapitalFreeFromBorrowingComplianceCovenants gr false credit instant Income retained in business and additional paid in capital free from borrowing compliance covenants. false false false false false false false false false false false verboselabel false 1 false true false false 2084700000 2084700000 false false false 2 false true false false 2084700000 2084700000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Income retained in business and additional paid in capital free from borrowing compliance covenants. No authoritative reference available. false 17 Borrowing capacity under global syndicated revolving credit facility 2 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 433400000 433400000 false false false 2 false true false false 433400000 433400000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). 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No authoritative reference available. false 22 Letters of credit and bank guarantees outstanding 2 gr_LettersOfCreditAndBankGuaranteesOutstanding gr false credit instant Letters of credit and bank guarantees outstanding. false false false false false false false false false false false verboselabel false 1 false true false false 20500000 20500000 false false false 2 false true false false 20500000 20500000 false false false 3 false true false false 300000 300000 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Letters of credit and bank guarantees outstanding. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 false 24 Cash paid to settle treasury locks 2 gr_CashPaidToSettleTreasuryLocks gr false credit duration Cash paid to settle treasury locks. false false false false false false false false false false false verboselabel false 1 false true false false 1800000 1800000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Cash paid to settle treasury locks. No authoritative reference available. false 25 Deferred transaction cost 2 us-gaap_DeferredFinanceCostsNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5000000 5000000 false false false 2 false true false false 5000000 5000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. 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No authoritative reference available. false 28 Offsetting lease obligation 2 gr_OffsettingLeaseObligation gr false debit duration Offsetting lease obligation. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 32000000 32000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Offsetting lease obligation. No authoritative reference available. false 29 Treasury lock amount 2 gr_TreasuryLockAmount gr false debit instant Treasury lock amount. false false false false false false false false false false false verboselabel false 1 true true false false 600000000 600000000 false false false 2 true true false false 600000000 600000000 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Treasury lock amount. No authoritative reference available. false 6 25 false NoRounding UnKnown UnKnown false true