EARNINGS PER SHARE (Details) - Earnings Per Share (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Net income available to common shares	$ 72.1		$ 65.7		$ 177.1		$ 209.2
Basic weighted average shares outstanding (in shares)	247,000,000		260,600,000		249,100,000		263,400,000
Dilutive effect of non-participating share-based awards	900,000		2,600,000		1,700,000		2,200,000
Diluted weighted average common shares outstanding (in shares)	247,900,000		263,200,000		250,800,000		265,600,000
Basic EPS	$ 0.29		$ 0.25		$ 0.71		$ 0.79
Diluted EPS	$ 0.29		$ 0.25		$ 0.71		$ 0.79
Weighted average shares excluded from diluted EPS because the effect would be anti-dilutive [Line Item]
Shares Repurchased including net shares, total	0		400,000		12,300,000		7,500,000
Shares Repurchased including net shares average price per share	$ 0		$ 17.04		$ 17.25		$ 15.68
Shares Repurchased Including Net shares Aggregate Payment	0.1		5.9		211.4		81.0
Remaining Authorization	$ 209.7				$ 209.7
Net Shares Tendered By Employees	7,500	[1]	3,800	[1]	635,200	[1]	254,300	[1]
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	9,800,000		6,000,000		6,700,000		8,600,000
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	0		42,600,000		0		42,600,000
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	0		(42,600,000)		0		(42,600,000)
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	42,600,000		42,600,000		42,600,000		42,600,000

[1] Net shares tendered by employees at vesting for tax withholding obligations (in thousands)