Retirement Benefit (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Company contribution range	3% to 7%
Recognized prior service credits	$ 17.2
Recognized prior service credits, net of tax	10.8
Recognized net actuarial losses	123.2
Recognized net actuarial losses, net of tax	80.4
Accumulated benefit obligation for pension plans	3,979.3	$ 3,960.2
Increase in projected benefit obligation due to change in mortality assumption	222.1
Expense related to defined contribution savings plans	46.3	43.8	$ 40.9
Defined Benefit Plan, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Prior service credits	14.0
Prior service credits, net of tax	8.9
Net actuarial losses	127.1
Net actuarial losses, net of tax	82.9
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized prior service credits	2.7	2.7	2.5
Recognized net actuarial losses	118.7	99.7	144.6
Lump-sum distributions to deferred vested participants in the U.S. defined benefit plans, total payments	108.8
Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future payments, during next fiscal year	47.0
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized prior service credits	14.5	10.2	10.7
Recognized net actuarial losses	$ 4.5	$ 2.9	$ 4.4
U.S. Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in gross healthcare trend rate	5.50%
Year of decrease in gross healthcare trend rate	2018
Non-U.S. Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease in gross healthcare trend rate	4.50%
Year of decrease in gross healthcare trend rate	2017
Estimated future payments, during next fiscal year	$ 11.7