Share Based Compensation (Details 2) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Summary of activity
Payout percentage	180.00%	173.00%	200.00%
Performance shares [Member]
Summary of activity
Outstanding shares, beginning balance	233
Granted, shares	69
Adjustment for performance results achieved	57
Vested and issued, shares	(127)	(232)	(345)
Forfeited, shares	(8)
Outstanding shares, ending balance	224	233
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Beginning Balance	$ 96.02
Granted, Wtd. Avg. Grant Date Share Fair Value	$ 108.48	$ 98.15	$ 101.57
Adjustment for performance results achieved, Wtd. Avg.Grant Date Fair Value	$ 87.00
Vested and issued, Wtd. Avg. Grant Date Share Fair Value	$ 87.00
Forfeited, Wtd. Avg. Grant Date Share Fair Value	$ 100.85
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Ending Balance	$ 102.54	$ 96.02
Vested shares, Total Fair Value	$ 14.2	$ 18.7	$ 25.8
Restricted stock and restricted stock units [Member]
Summary of activity
Outstanding shares, beginning balance	199
Granted, shares	53
Vested and issued, shares	(56)
Forfeited, shares	(6)
Outstanding shares, ending balance	190	199
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Beginning Balance	$ 74.63
Granted, Wtd. Avg. Grant Date Share Fair Value	$ 109.69	$ 80.17	$ 73.73
Vested and issued, Wtd. Avg. Grant Date Share Fair Value	$ 73.31
Forfeited, Wtd. Avg. Grant Date Share Fair Value	$ 83.92
Outstanding, Wtd. Avg. Grant Date Share Fair Value, Ending Balance	$ 84.57	$ 74.63
Vested shares, Total Fair Value	$ 6.4	$ 9.4	$ 6.2