Retirement Benefits (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Summary of benefit obligation plan assets and funded status
Plan assets at end of year	$ 3,367.0	$ 3,213.3
Net amount on balance sheet consists of:
Retirement benefits	(595.9)	(1,105.8)
Pension Benefits [Member]
Summary of benefit obligation plan assets and funded status
Benefit obligation at beginning of year	4,150.2	3,482.6
Service cost	92.1	71.8	70.1
Interest cost	160.2	167.6	163.9
Actuarial (gains) losses	(401.0)	597.0
Plan amendments
Plan participant contributions	5.5	5.4
Benefits paid	(198.0)	(176.6)
Currency translation and other	(4.2)	2.4
Benefit obligation at end of year	3,804.8	4,150.2	3,482.6
Plan assets at beginning of year	3,213.3	2,572.9
Actual return on plan assets	309.0	470.6
Company contributions	41.3	341.1
Currency translation and other	(4.1)	(0.1)
Plan assets at end of year	3,367.0	3,213.3	2,572.9
Funded status of plans	(437.8)	(936.9)
Net amount on balance sheet consists of:
Other assets	10.3	0.8
Compensation and benefits	(10.8)	(10.2)
Retirement benefits	(437.3)	(927.5)
Net amount on balance sheet	(437.8)	(936.9)
Other Postretirement Benefits [Member]
Summary of benefit obligation plan assets and funded status
Benefit obligation at beginning of year	172.5	157.7
Service cost	2.3	2.2	3.5
Interest cost	6.3	7.2	10.2
Actuarial (gains) losses	(14.9)	24.0
Plan amendments	0	(3.1)
Plan participant contributions	9.4	10.4
Benefits paid	(24.7)	(26.6)
Currency translation and other	(0.7)	0.7
Benefit obligation at end of year	150.2	172.5	157.7
Plan assets at beginning of year
Actual return on plan assets
Company contributions	15.3	16.2
Currency translation and other
Plan assets at end of year
Funded status of plans	(150.2)	(172.5)
Net amount on balance sheet consists of:
Other assets
Compensation and benefits	(14.7)	(15.8)
Retirement benefits	(135.5)	(156.7)
Net amount on balance sheet	$ (150.2)	$ (172.5)