Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Schedule of stock-based compensation costs (Details)

v2.4.1.9
Share-Based Compensation - Schedule of stock-based compensation costs (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 Related Costs [Abstract]        
Share-based compensation costs $ 4.1us-gaap_AllocatedShareBasedCompensationExpense $ 3.4us-gaap_AllocatedShareBasedCompensationExpense $ 6.3us-gaap_AllocatedShareBasedCompensationExpense $ 5.1us-gaap_AllocatedShareBasedCompensationExpense
Less impact of income tax benefit 1.5us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based compensation costs, net of tax $ 2.6us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 2.1us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 4.0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 3.2us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax