Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Share-Based Compensation - Schedule of stock-based compensation costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Compensation Related Costs [Abstract]        
Share-based compensation costs $ 3.9 $ 3.1 $ 6.2 $ 5.7
Less impact of income tax benefit 1.0 1.0 1.6 2.0
Share-based compensation costs, net of tax $ 2.9 $ 2.1 $ 4.6 $ 3.7