Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2022	Jan. 31, 2021	Jul. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	$ 1,115.9	$ 1,052.6	$ 992.9	$ 1,137.1	$ 992.9	$ 992.9
Other comprehensive (loss) income before reclassifications and tax	(17.9)	39.8		(27.2)	39.1
Tax benefit (expense)	0.2	0.3		0.0	(0.7)
Other comprehensive (loss) income before reclassifications, net of tax	(17.7)	40.1		(27.2)	38.4
Reclassifications, before tax	3.8	(0.5)		6.9	3.1
Tax (expense) benefit	(0.8)	0.2		(1.6)	(0.5)
Reclassifications, net of tax	3.0	(0.3)		5.3	2.6
Net other comprehensive (loss) income	(14.7)	39.8		(21.9)	41.0
Ending Balance	1,116.8	1,074.4	1,052.6	1,116.8	1,074.4	1,137.1
Accumulated other comprehensive loss	(140.1)			(140.1)		(118.2)
Settlement cost				1.2
Curtailment charge	1.2		0.8			0.8
Scenario, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated other comprehensive loss	1.7			1.7		4.0
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(125.4)	(182.8)	(184.0)	(118.2)	(184.0)	(184.0)
Net other comprehensive (loss) income	(14.7)	39.8		(21.9)	41.0
Ending Balance	(140.1)	(143.0)	(182.8)	(140.1)	(143.0)	(118.2)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(54.5)	(79.0)	(74.0)	(44.0)	(74.0)	(74.0)
Other comprehensive (loss) income before reclassifications and tax	(17.1)	41.5		(27.6)	36.5
Tax benefit (expense)	0.0	0.0		0.0	0.0
Other comprehensive (loss) income before reclassifications, net of tax	(17.1)	41.5		(27.6)	36.5
Reclassifications, before tax	0.0	0.0		0.0	0.0
Tax (expense) benefit	0.0	0.0		0.0	0.0
Reclassifications, net of tax	0.0	0.0		0.0	0.0
Net other comprehensive (loss) income	(17.1)	41.5		(27.6)	36.5
Ending Balance	(71.6)	(37.5)	(79.0)	(71.6)	(37.5)	(44.0)
Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(72.7)	(103.9)	(110.0)	(74.7)	(110.0)	(110.0)
Other comprehensive (loss) income before reclassifications and tax	(1.7)	0.0		(1.7)	4.0
Tax benefit (expense)	0.4	0.0		0.4	(1.0)
Other comprehensive (loss) income before reclassifications, net of tax	(1.3)	0.0		(1.3)	3.0
Reclassifications, before tax	4.3	0.2		6.8	3.8
Tax (expense) benefit	(1.0)	(0.2)		(1.5)	(0.7)
Reclassifications, net of tax	3.3	0.0		5.3	3.1
Net other comprehensive (loss) income	2.0	0.0		4.0	6.1
Ending Balance	(70.7)	(103.9)	(103.9)	(70.7)	(103.9)	(74.7)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	1.8	0.1	0.0	0.5	0.0	0.0
Other comprehensive (loss) income before reclassifications and tax	0.9	(1.7)		2.1	(1.4)
Tax benefit (expense)	(0.2)	0.3		(0.4)	0.3
Other comprehensive (loss) income before reclassifications, net of tax	0.7	(1.4)		1.7	(1.1)
Reclassifications, before tax	(0.5)	(0.7)		0.1	(0.7)
Tax (expense) benefit	0.2	0.4		(0.1)	0.2
Reclassifications, net of tax	(0.3)	(0.3)		0.0	(0.5)
Net other comprehensive (loss) income	0.4	(1.7)		1.7	(1.6)
Ending Balance	$ 2.2	$ (1.6)	$ 0.1	$ 2.2	$ (1.6)	$ 0.5