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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Income Taxes    
Effective tax rate (as a percent) 12.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized tax benefits, exclusive of interest and penalties $ 7.6us-gaap_UnrecognizedTaxBenefits $ 4.7us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits from permanent tax adjustments that, if recognized, would affect the effective rate 4.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Estimated unrecognized tax benefits resulting from possible resolution of reviews by domestic and international taxing authorities 1.0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit  
Period of cumulative income or loss under assessment to determine if a valuation allowance is required 3 years  
Valuation allowance on net deferred tax assets for Australia $ 14.3us-gaap_DeferredTaxAssetsValuationAllowance