Derivative Instruments - Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instruments - USD ($) $ in Millions	Jul. 31, 2016	Oct. 31, 2015	Jul. 31, 2015
Interest rate contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 2,448.3	$ 2,679.5	$ 2,651.3
Interest rate contracts | Purchased
Derivatives Not Designated as Hedging Instruments
Notional amounts	2,667.1	1,902.1	2,086.8
Interest rate contracts | Sold
Derivatives Not Designated as Hedging Instruments
Notional amounts	2,667.1	1,902.1	2,086.8
Foreign exchange contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	1,325.7	966.6	853.6
Cross-currency interest rate contracts
Derivatives Not Designated as Hedging Instruments
Notional amounts	$ 63.7	$ 75.6	$ 79.7