QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 706.0	$ 655.4	$ 632.6	$ 661.2	$ 573.9	$ 474.5	$ 474.8	$ 465.0	$ 2,655.2	$ 1,988.2	$ 1,686.1
Gross profit	346.7	315.4	304.2	290.7	256.7	209.5	214.2	199.9	1,257.0	880.3	779.9
Net income (loss) attributable to common shareholders	$ 51.7	$ 45.3	$ 22.3	$ 4.8	$ (9.6)	$ 19.1	$ 26.1	$ 12.1	$ 124.1	$ 47.7	$ 60.6
Basic net income (loss) attributable to common shareholders per common share	$ 0.79	$ 0.69	$ 0.34	$ 0.07	$ (0.16)	$ 0.34	$ 0.46	$ 0.21	$ 1.90	$ 0.83	$ 1.05
Diluted net income (loss) attributable to common shareholders per common share	$ 0.77	$ 0.68	$ 0.33	$ 0.07	$ (0.16)	$ 0.33	$ 0.45	$ 0.21	$ 1.86	$ 0.82	$ 1.04