EARNINGS PER SHARE (Details) - Earnings Per Share (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Net income available to common shares	$ 79.2	$ 65.3
Basic weighted average shares outstanding (in shares)	252.6	265.9
Dilutive effect of non-participating share-based awards	2.7	2.0
Diluted weighted average common shares outstanding (in shares)	255.3	267.9
Basic EPS	$ 0.31	$ 0.25
Diluted EPS	$ 0.31	$ 0.24
Share Based Awards [Member]
Weighted average shares excluded from diluted EPS because the effect would be anti-dilutive [Line Item]
Weighted average shares excluded from diluted EPS	5.1	12.7
Notes [Member]
Weighted average shares excluded from diluted EPS because the effect would be anti-dilutive [Line Item]
Weighted average shares excluded from diluted EPS	42.6	42.6
Note Hedges [Member]
Weighted average shares excluded from diluted EPS because the effect would be anti-dilutive [Line Item]
Weighted average shares excluded from diluted EPS	(42.6)	(42.6)
Warrant [Member]
Weighted average shares excluded from diluted EPS because the effect would be anti-dilutive [Line Item]
Weighted average shares excluded from diluted EPS	42.6	42.6