Equity and Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ (1,047.5)	$ (957.9)
Other comprehensive income, net of tax	$ (22.2)	$ 11.9	19.2	35.4
Ending balance	(1,129.3)	(986.8)	(1,129.3)	(986.8)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			249.3	270.2
Other comprehensive income, net of tax			11.7	3.5
Ending balance	237.6	266.7	237.6	266.7
Interest Rate Derivative
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(5.1)	0.0
Other comprehensive income, net of tax			5.9	4.8
Ending balance	(11.0)	(4.8)	(11.0)	(4.8)
Minimum Pension Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(114.0)	128.2
Other comprehensive income, net of tax			(1.8)	29.4
Ending balance	(112.2)	98.8	(112.2)	98.8
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			358.2	398.4
Other comprehensive income, net of tax			19.4	37.7
Ending balance	$ 338.8	$ 360.7	$ 338.8	$ 360.7