FINANCIAL INSTRUMENTS, FAIR VALUE AND RISK MANAGEMENT - Liquidity Risk (Details) - USD ($) $ in Millions	Jan. 31, 2017	Oct. 31, 2016	Jan. 31, 2016	Oct. 31, 2015
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 89.0	$ 165.0	$ 188.0	$ 328.7
Liquidity risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	89.0
Liquidity risk | Line of credit
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Undrawn lines of credit available	$ 188.9