Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ 60.9	$ 104.9	$ (61.6)	$ 180.7
Other comprehensive (loss) income:
Foreign currency translation adjustment	(43.0)	38.3	59.3	66.5
Comprehensive income (loss) attributable to Cooper stockholders	$ 17.9	$ 143.2	$ (2.3)	$ 247.2