Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefits - Narrative (Details)

v2.4.1.9
Retirement Benefits - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]        
Postemployment Benefits, Period Expense $ 0.1us-gaap_PostemploymentBenefitsPeriodExpense $ 0.1us-gaap_PostemploymentBenefitsPeriodExpense $ 0.2us-gaap_PostemploymentBenefitsPeriodExpense $ 0.2us-gaap_PostemploymentBenefitsPeriodExpense
Defined Contribution Plan, Cost Recognized $ 2.4us-gaap_DefinedContributionPlanCostRecognized $ 2.2us-gaap_DefinedContributionPlanCostRecognized $ 4.5us-gaap_DefinedContributionPlanCostRecognized $ 4.3us-gaap_DefinedContributionPlanCostRecognized