EARNINGS PER COMMON SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Basic EPS:
Net Income	$ 47.1us-gaap_NetIncomeLoss	$ 35.6us-gaap_NetIncomeLoss
Less: Income allocated to participating securities	0.2	0.2
Net Income Available to Common Shareholders	46.9	35.4
Weighted Average Shares Outstanding, Basic (in Shares)	43.1	32.6
Basic Earnings Per Share of Common Stock (in dollars per share)	$ 1.09us-gaap_EarningsPerShareBasic	$ 1.09us-gaap_EarningsPerShareBasic
Diluted EPS:
Net Income	47.1us-gaap_NetIncomeLoss	35.6us-gaap_NetIncomeLoss
Less: Income allocated to participating securities	0.2	0.2
Net Income Available to Common Shareholders	$ 46.9	$ 35.4
Weighted Average Shares Outstanding, Basic (in Shares)	43.1	32.6
Dilutive Effect of Stock Options, Restricted Stock and Restricted Stock Units (in shares)	0.1	0
Weighted Average Diluted Shares (in shares)	43.2	32.6
Diluted Earnings Per Share of Common Stock (in dollars per share)	$ 1.09us-gaap_EarningsPerShareDiluted	$ 1.09us-gaap_EarningsPerShareDiluted
Restricted stock and stock units subject to performance and/or market conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding shares excluded from calculation of diluted EPS (in shares)	0.4	0.3

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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