Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ (16.0)		$ (16.4)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(15.8)		(26.9)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	64.0		51.7
Accumulated Other Comprehensive Income (Loss), Net of Tax	32.2	(37.3)	8.4
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	52.8
Reclassification Adjustment of Other Comprehensive Income, Before Tax	(15.5)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	(2.0)	3.5
Foreign currency, net of tax	12.3	16.1
Reclassification Adjustment of Other Comprehensive Income, After Tax	(13.4)
Other comprehensive income	39.4	28.5
Reclassification Adjustment of Other Comprehensive Income, Net of Tax, attributable to Noncontrolling Interest	(15.6)
Benefit plans, net of tax	23.8
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	3.7	4.0
Reclassification Adjustment of Other Comprehensive Income, Tax	2.1
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(13.8)	17.4
Significant Accounting Policies (Textual) [Abstract]
Voting rights in investment businesses not traded publicly accounted for under the cost method, Maximum	20.00%
Ownership interests in certain subsidiaries under equity method investment, maximum	100.00%
Impact of French Tax Law Change	5.7
Postretirement Benefit Plan Adjustments [Member]
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	0.3
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax	0.1
Other comprehensive income	0.4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	0
Benefit plans, net of tax	0.4
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	0.4
Derivative [Member]
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	40.5
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	(15.8)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	2.0
Other comprehensive income	26.7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest	(15.6)
Benefit plans, net of tax	11.1
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(13.8)
Foreign Currency Translation [Member]
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	12.3
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	0
Foreign currency, net of tax	0
Other comprehensive income	12.3
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	0
Benefit plans, net of tax	12.3
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 0