Retirement Benefit (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ 12.9
Defined Benefit Plan Amortization Of Prior Service Cost Credit Net Of Tax	8.2
Defined Benefit Plan, Actuarial Gain (Loss)	97.1
Defined Benefit Plan Amortization Of Gains Losses Net Of Tax	62.5
Defined contribution plan contribution by employer range	3% to 7%
Voluntary contribution to qualified pension plan trust	300.0	150.0	150.0
Accumulated benefit obligation for pension plans	3,865.3	3,264.9
Expense related to defined contribution savings plans	38.2	31.2	23.3
Defined Benefit Plan, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Prior service credits	13.3
Prior service credits, net of tax	8.4
Net actuarial losses	149.5
Net actuarial losses, net of tax	96.0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	2.3	2.2	3.8
Defined Benefit Plan, Actuarial Gain (Loss)	94.7	63.7	42.1
Non US Pension Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Employer contribution to Defined benefit plan, during next fiscal year	40
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	10.6	10.6	10.6
Defined Benefit Plan, Actuarial Gain (Loss)	2.4	6.4	8.4
US Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in gross healthcare trend rate	5.50%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2017
Non-U.S. Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in gross healthcare trend rate	4.50%
Estimated Employer contribution to Defined benefit plan, during next fiscal year	16
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2017
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	153
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	202
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior Period Reclassification Adjustment	$ 49