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STOCK-BASED COMPENSATION - Compensation Costs Recognized (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total compensation cost $ 6.9 $ 7.4 $ 6.7
Compensation cost capitalized (1.3) (3.3) (2.2)
Prior period disallowed stock compensation capitalization 6.9 0.0 0.0
Compensation cost recognized in net income 12.5 4.1 4.5
Income tax benefit recognized in net income (4.0) (1.5) (1.7)
Compensation cost recognized in net income, net of income tax $ 8.5 $ 2.6 $ 2.8