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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 |  |

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