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STOCK-BASED COMPENSATION - Compensation Costs Recognized (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total compensation cost $ 7.4 $ 6.7 $ 6.7
Compensation cost capitalized (3.3) (2.2) (1.8)
Compensation cost recognized in net income 4.1 4.5 4.9
Income tax benefit recognized in net income (1.5) (1.7) (1.9)
Compensation cost recognized in net income, net of income tax $ 2.6 $ 2.8 $ 3.0