Quarterly report pursuant to Section 13 or 15(d)

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

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Share-Based Compensation - Schedule of stock-based compensation costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Compensation Related Costs [Abstract]        
Share-based compensation costs $ 2.6 $ 1.1 $ 8.9 $ 6.2
Less impact of income tax benefit 1.0 0.4 3.3 2.3
Share-based compensation costs, net of tax $ 1.6 $ 0.7 $ 5.6 $ 3.9