Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 90.5	$ 103.2
Other comprehensive income:
Foreign currency translation adjustment, net of tax	16.7	32.7
Comprehensive income	$ 107.2	$ 135.9