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Derivative Instruments and Fair Value Measurement (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract]    
Pre-tax gains (losses) recorded in other comprehensive income related to forward exchange contracts (cash flow hedges) $ 10.9us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax $ 1.6us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
Pre-tax gains (losses) recorded in other comprehensive income related to foreign currency denominated debt (net investment hedges) 0.7us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax (0.3)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
Total pre-tax gains (losses) recorded in other comprehensive income related to hedges 11.6us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax 1.3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]    
Net unrealized gains on cash flow hedges to be reclassified into earnings during the next 12 months 14.6us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months  
Net unrealized gains on cash flow hedges to be reclassified into earnings during the next 12 months, net of tax 15.2rok_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNextTwelveMonthsNetOfTax  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges 4.6us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet 0.5us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
Amount recognized in earnings as a result of ineffective hedges is not significant not significant  
Sales [Member]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges (1.2)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
(0.2)us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
Cost of sales [Member]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges 5.8us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
0.7us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Other income (expense) [Member]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Pre-tax amount of gains (losses) from forward exchange contracts not designated as hedging instruments recognized in the Consolidated Statement of Operations $ 1.6us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
$ 3.9us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember