Derivative Instruments | Net Investment Hedge Notional Amounts (Details) $ in Millions	Oct. 31, 2019 USD ($)
Maturity Year One [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 0.0
Maturity Year Two [Member]
Derivative [Line Items]
Derivative, Notional Amount	21.6
Maturity Year Three [Member]
Derivative [Line Items]
Derivative, Notional Amount	21.6
Maturity Year Four [Member]
Derivative [Line Items]
Derivative, Notional Amount	267.0
Maturity Year Five [Member]
Derivative [Line Items]
Derivative, Notional Amount	12.4
Maturity After Year Five [Member]
Derivative [Line Items]
Derivative, Notional Amount	293.4
Net Investment Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 616.0