Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
AOCI Rollforward
Beginning Balance	$ 892.7	$ 857.8	$ 854.5
Other comprehensive income (loss) before reclassifications and tax	2.5	(43.5)
Tax benefit	4.1	4.2
Other comprehensive income (loss) before reclassifications, net of tax	6.6	(39.3)
Reclassifications, before tax	3.5	(4.7)
Tax benefit (expense)	(1.2)	0.9
Reclassifications, net of tax	2.3	(3.8)
Net other comprehensive income (loss)	8.9	(43.1)	7.2
Ending Balance	992.9	892.7	857.8
Pension settlement charge	3.1	2.9
Accumulated other comprehensive loss	184.0	192.9
Adjustments
AOCI Rollforward
Accumulated other comprehensive loss	(16.8)	16.3
Total
AOCI Rollforward
Beginning Balance	(192.9)	(149.8)	(157.0)
Ending Balance	(184.0)	(192.9)	(149.8)
Foreign currency translation adjustment
AOCI Rollforward
Beginning Balance	(92.7)	(66.1)
Other comprehensive income (loss) before reclassifications and tax	18.7	(26.6)
Tax benefit	0.0	0.0
Other comprehensive income (loss) before reclassifications, net of tax	18.7	(26.6)
Reclassifications, before tax	0.0	0.0
Tax benefit (expense)	0.0	0.0
Reclassifications, net of tax	0.0	0.0
Net other comprehensive income (loss)	18.7	(26.6)
Ending Balance	(74.0)	(92.7)	(66.1)
Pension benefits
AOCI Rollforward
Beginning Balance	(99.0)	(82.9)
Other comprehensive income (loss) before reclassifications and tax	(16.8)	(16.3)
Tax benefit	4.1	4.1
Other comprehensive income (loss) before reclassifications, net of tax	(12.7)	(12.2)
Reclassifications, before tax	2.5	(4.8)
Tax benefit (expense)	(0.8)	0.9
Reclassifications, net of tax	1.7	(3.9)
Net other comprehensive income (loss)	(11.0)	(16.1)
Ending Balance	(110.0)	(99.0)	(82.9)
Derivative financial instruments
AOCI Rollforward
Beginning Balance	(1.2)	(0.8)
Other comprehensive income (loss) before reclassifications and tax	0.6	(0.6)
Tax benefit	0.0	0.1
Other comprehensive income (loss) before reclassifications, net of tax	0.6	(0.5)
Reclassifications, before tax	1.0	0.1
Tax benefit (expense)	(0.4)	0.0
Reclassifications, net of tax	0.6	0.1
Net other comprehensive income (loss)	1.2	(0.4)
Ending Balance	$ 0.0	$ (1.2)	$ (0.8)