LEASES - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Leases [Abstract]
Operating lease assets	$ 318.1	$ 0.0
Finance lease assets	5.0
Total lease assets	323.1
Current portion of operating lease liabilities	53.2	0.0
Current finance lease liabilities	1.8
Total current lease liabilities	55.0
Operating lease liabilities	267.5	$ 0.0
Non-current finance lease liabilities	3.2
Total non-current lease liabilities	270.7
Total lease liabilities	$ 325.7