2.2.0.7 true Guarantees (Details) 0616 - Disclosure - Guarantees (Details) true false In Millions 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 GBP false false GBP Standard http://www.xbrl.org/2003/iso4217 GBP iso4217 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 Environmental remediation and other indemnifications (Note 15, "Contingencies") [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi gr_EnvironmentalRemediationAndOtherIndemnificationsMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false Guarantees of residual value on leases [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi gr_GuaranteesOfResidualValueOnLeasesMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Guarantees of JV debt and other financial instruments [Member] us-gaap_GuaranteeObligationsByNatureAxis xbrldi http://xbrl.org/2006/xbrldi gr_GuaranteesOfJVDebtAndOtherFinancialInstrumentsMember us-gaap_GuaranteeObligationsByNatureAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Environmental remediation and indemnifications and financial guarantees outstanding 3 gr_EnvironmentalRemediationAndOtherIndemnificationsAndFinancialGuaranteesOutstandingDetailAbstract gr false na duration Environmental remediation and other indemnifications and financial guarantees outstanding. 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 Environmental remediation and other indemnifications and financial guarantees outstanding. false 6 Maximum Potential Payment 4 us-gaap_GuaranteeObligationsMaximumExposure 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 true true false false 11000000 11.0 true false false 6 true true false false 34300000 34.3 true false false xbrli:monetaryItemType monetary Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. 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Does not include the balance for the extended product warranty liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b false 10 Net provisions for warranties issued during the period 4 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 23600000 23.6 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 Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. 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Does not include any increase (decrease) in the liability for accruals related to extended product warranties Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b false 12 Payments 4 us-gaap_StandardProductWarrantyAccrualPayments us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -24100000 -24.1 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 Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any increase (decrease) in the liability for payments related to extended product warranties Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b false 13 Foreign currency translation 4 us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -5800000 -5.8 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 Increase (decrease) in standard product warranty liability due to currency translation. Does not include any increase (decrease) in an extended product warranty liability due to currency translation Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph b true 14 Ending Balance 4 us-gaap_StandardProductWarrantyAccrual us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 135900000 135.9 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 Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. 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