Notes Payable (Details 1) (USD $) In Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Summary of senior note retirements
Repurchases of senior notes	$ 2.6	$ 129.8
Total retirements of senior notes	185.0	312.2
6% senior notes matured April 2011 [Member]
Summary of senior note retirements
Maturities of senior notes	70.1	70.1
5.375% senior notes due 2012 redeemed in April 2011[Member]
Summary of senior note retirements
Early redemption of senior notes	112.3	112.3
7.875% senior notes due 2011, net [Member]
Summary of senior note retirements
Repurchases of senior notes	0	12.9
5.375% senior notes due 2012 [Member]
Summary of senior note retirements
Repurchases of senior notes	0	34.3
6.875% senior notes due [Member]
Summary of senior note retirements
Repurchases of senior notes	2.6	2.6
6.125% senior notes due 2014, net [Member]
Summary of senior note retirements
Repurchases of senior notes	0	1.0
5.625% senior notes due [Member]
Summary of senior note retirements
Repurchases of senior notes	0	9.7
5.25% senior notes due [Member]
Summary of senior note retirements
Repurchases of senior notes	0	10.8
6.5% senior notes due [Member]
Summary of senior note retirements
Repurchases of senior notes	0	37.5
5.625% senior notes due 2016, net [Member]
Summary of senior note retirements
Repurchases of senior notes	$ 0	$ 21.0