1.0.0.3 false Consolidated Statement of Cash Flows (USD $) In Millions false 1 $ false false 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 false 2 $ false false 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 false 3 $ false false 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 3 Operating Activities 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 4 Consolidated net income 2 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 610800000 610.8 false false 2 true true 699200000 699.2 false false 3 true true 503100000 503.1 false false No definition available. No authoritative reference available. false 5 Adjustments to reconcile consolidated net income to net cash provided by operating activities: 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 6 (Income) loss from discontinued operations 3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -34500000 -34.5 false false 2 false true -7600000 -7.6 false false 3 false true 13400000 13.4 false false No definition available. No authoritative reference available. false 7 Restructuring and consolidation: 3 us-gaap_RestructuringCostsAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 8 Expenses 4 us-gaap_RestructuringCharges us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 21600000 21.6 false false 2 false true 2100000 2.1 false false 3 false true 1000000 1.0 false false No definition available. No authoritative reference available. false 9 Payments 4 us-gaap_PaymentsForRestructuring us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -13600000 -13.6 false false 2 false true -2500000 -2.5 false false 3 false true -4400000 -4.4 false false No definition available. No authoritative reference available. false 10 Pension and postretirement benefits: 3 gr_PensionAndPostretirementBenefits gr false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 11 Expenses 4 us-gaap_PensionAndOtherPostretirementBenefitExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 199500000 199.5 false false 2 false true 97700000 97.7 false false 3 false true 116300000 116.3 false false No definition available. No authoritative reference available. false 12 Contributions and benefit payments 4 us-gaap_PensionAndOtherPostretirementBenefitContributions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -271800000 -271.8 false false 2 false true -254700000 -254.7 false false 3 false true -163700000 -163.7 false false No definition available. No authoritative reference available. false 13 Depreciation and amortization 3 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 249300000 249.3 false false 2 false true 257200000 257.2 false false 3 false true 250200000 250.2 false false No definition available. No authoritative reference available. false 14 Excess tax benefits related to share-based payment arrangements 3 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -5000000 -5.0 false false 2 false true -8100000 -8.1 false false 3 false true -16600000 -16.6 false false No definition available. No authoritative reference available. false 15 Share-based compensation expense 3 us-gaap_ShareBasedCompensation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 66700000 66.7 false false 2 false true 36400000 36.4 false false 3 false true 70000000 70.0 false false No definition available. No authoritative reference available. false 16 Deferred income taxes 3 us-gaap_DeferredIncomeTaxesAndTaxCredits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 139400000 139.4 false false 2 false true 143400000 143.4 false false 3 false true 137800000 137.8 false false No definition available. No authoritative reference available. false 17 Change in assets and liabilities, net of effects of acquisitions and divestitures: 3 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 18 Receivables 4 us-gaap_IncreaseDecreaseInReceivables us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 44800000 44.8 false false 2 false true -125700000 -125.7 false false 3 false true -81400000 -81.4 false false No definition available. No authoritative reference available. false 19 Inventories, excluding pre-production and excess-over-average 4 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -42300000 -42.3 false false 2 false true -189800000 -189.8 false false 3 false true -89200000 -89.2 false false No definition available. No authoritative reference available. false 20 Pre-production and excess-over-average inventories 4 gr_PreProductionAndExcessOverAverageInventories gr false credit duration monetary Portion of in-process inventory for pre-production and excess-over-average inventory accounted for under long-term contract... false false false false false false false false false 1 false true -180200000 -180.2 false false 2 false true -120600000 -120.6 false false 3 false true -116300000 -116.3 false false Portion of in-process inventory for pre-production and excess-over-average inventory accounted for under long-term contract accounting. No authoritative reference available. false 21 Other current assets 4 us-gaap_IncreaseDecreaseInOtherOperatingAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 5500000 5.5 false false 2 false true -8600000 -8.6 false false 3 false true 5700000 5.7 false false No definition available. No authoritative reference available. false 22 Accounts payable 4 us-gaap_IncreaseDecreaseInAccountsPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -142700000 -142.7 false false 2 false true 137800000 137.8 false false 3 false true -10500000 -10.5 false false No definition available. No authoritative reference available. false 23 Accrued expenses 4 us-gaap_IncreaseDecreaseInAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2500000 2.5 false false 2 false true 43400000 43.4 false false 3 false true 95000000 95.0 false false No definition available. No authoritative reference available. false 24 Income taxes payable/receivable 4 gr_IncomeTaxesPayableReceivable gr false debit duration monetary The net change during the reporting period in income taxes receivable, which represents the amount due from tax authorities... false false false false false false false false false 1 false true 51200000 51.2 false false 2 false true 36500000 36.5 false false 3 false true -84500000 -84.5 false false The net change during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid and the net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings. No authoritative reference available. false 25 Other non-current assets and liabilities 4 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -44700000 -44.7 false false 2 false true 50500000 50.5 false false 3 false true -32200000 -32.2 false false No definition available. No authoritative reference available. true 26 Net Cash Provided By Operating Activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 656500000 656.5 false false 2 false true 786600000 786.6 false false 3 false true 593700000 593.7 false false No definition available. No authoritative reference available. true 27 Investing Activities 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 28 Purchases of property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -169000000 -169.0 false false 2 false true -284700000 -284.7 false false 3 false true -282600000 -282.6 false false No definition available. No authoritative reference available. false 29 Proceeds from sale of property, plant and equipment 2 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1300000 1.3 false false 2 false true 6500000 6.5 false false 3 false true 3300000 3.3 false false No definition available. No authoritative reference available. false 30 Payments made for acquisitions, net of cash acquired 2 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -392100000 -392.1 false false 2 false true -131800000 -131.8 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 31 Investments in and advances to equity investees 2 us-gaap_PaymentsToAcquireEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2.0 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. true 32 Net Cash Used In Investing Activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -561800000 -561.8 false false 2 false true -410000000 -410.0 false false 3 false true -279300000 -279.3 false false No definition available. No authoritative reference available. true 33 Financing Activities 1 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 34 Increase (decrease) in short-term debt, net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -35000000 -35.0 false false 2 false true 15900000 15.9 false false 3 false true 9200000 9.2 false false No definition available. No authoritative reference available. false 35 Proceeds from issuance of long-term debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 597000000 597.0 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 36 Repayments of long-term debt and capital lease obligations 2 us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -120500000 -120.5 false false 2 false true -201000000 -201.0 false false 3 false true -1400000 -1.4 false false No definition available. No authoritative reference available. false 37 Proceeds from issuance of common stock 2 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 35300000 35.3 false false 2 false true 24700000 24.7 false false 3 false true 95900000 95.9 false false No definition available. No authoritative reference available. false 38 Purchases of treasury stock 2 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -23800000 -23.8 false false 2 false true -138400000 -138.4 false false 3 false true -214600000 -214.6 false false No definition available. No authoritative reference available. false 39 Dividends paid 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -125600000 -125.6 false false 2 false true -114100000 -114.1 false false 3 false true -101200000 -101.2 false false No definition available. No authoritative reference available. false 40 Excess tax benefits related to share-based payment arrangements 2 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 5000000 5.0 false false 2 false true 8100000 8.1 false false 3 false true 16600000 16.6 false false No definition available. No authoritative reference available. false 41 Distributions to noncontrolling interests 2 us-gaap_PaymentsToMinorityShareholders us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -27800000 -27.8 false false 2 false true -9600000 -9.6 false false 3 false true -7000000 -7.0 false false No definition available. No authoritative reference available. true 42 Net Cash Provided By (Used In) Financing Activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 304600000 304.6 false false 2 false true -414400000 -414.4 false false 3 false true -202500000 -202.5 false false No definition available. No authoritative reference available. true 43 Discontinued Operations 1 us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 44 Net cash provided by (used in) operating activities 2 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 34100000 34.1 false false 2 false true -2600000 -2.6 false false 3 false true 1300000 1.3 false false No definition available. No authoritative reference available. false 45 Net cash provided by (used in) investing activities 2 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 15700000 15.7 false false 3 false true 88800000 88.8 false false No definition available. No authoritative reference available. false 46 Net cash provided by (used in) financing activities 2 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. true 47 Net cash provided by discontinued operations 2 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 34100000 34.1 false false 2 false true 13100000 13.1 false false 3 false true 90100000 90.1 false false No definition available. No authoritative reference available. false 48 Effect of exchange rate changes on cash and cash equivalents 1 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 7300000 7.3 false false 2 false true -11000000 -11.0 false false 3 false true 2700000 2.7 false false No definition available. No authoritative reference available. true 49 Net increase (decrease) in cash and cash equivalents 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 440700000 440.7 false false 2 false true -35700000 -35.7 false false 3 false true 204700000 204.7 false false No definition available. No authoritative reference available. false 50 Cash and cash equivalents at beginning of period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 370300000 370.3 false false 2 false true 406000000 406.0 false false 3 false true 201300000 201.3 false false No definition available. No authoritative reference available. false 51 Cash and cash equivalents at end of period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 true true 811000000 811.0 false false 2 true true 370300000 370.3 false false 3 true true 406000000 406.0 false false No definition available. No authoritative reference available. false false 3 49 false HundredThousands UnKnown UnKnown false true