Derivatives and Hedging Activities (Details 2) - Fair Value Hedging [Member] - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Designated as Hedging Instrument [Member]
Asset Derivatives Fair Value	$ 0.5	$ 0.8
Liability Derivatives Fair Value	(0.8)	(3.4)
Not Designated as Hedging Instrument [Member]
Asset Derivatives Fair Value
Liability Derivatives Fair Value	(3.8)	(4.4)
Other Assets [Member] | Interest Rate and Foreign Exchange Products [Member] | Designated as Hedging Instrument [Member]
Asset Derivatives Fair Value	0.5	0.8
Other Assets [Member] | Interest Rate and Foreign Exchange Products [Member] | Not Designated as Hedging Instrument [Member]
Asset Derivatives Fair Value
Other Liabilities [Member] | Interest Rate and Foreign Exchange Products [Member] | Designated as Hedging Instrument [Member]
Liability Derivatives Fair Value	(0.8)	(3.4)
Other Liabilities [Member] | Interest Rate and Foreign Exchange Products [Member] | Not Designated as Hedging Instrument [Member]
Liability Derivatives Fair Value	$ (3.8)	$ (4.4)