Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 103.2	$ (122.5)
Other comprehensive income:
Foreign currency translation adjustment	32.7	102.3
Comprehensive income (loss)	$ 135.9	$ (20.2)