LEASES - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2020	Oct. 31, 2019
Leases [Abstract]
Operating lease assets	$ 321.0	$ 0.0
Finance lease assets	5.0
Total lease assets	326.0
Current portion of operating lease liabilities	53.1	0.0
Current finance lease liabilities	1.7
Total current lease liabilities	54.8
Operating lease liabilities	270.6	$ 0.0
Non-current finance lease liabilities	3.3
Total non-current lease liabilities	273.9
Total lease liabilities	$ 328.7