Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	$ 940.4	$ 872.6	$ 892.7	$ 857.8
Other comprehensive (loss) income before reclassifications and tax	(40.9)	(12.0)	(30.3)	(11.4)
Tax benefit (expense)	1.0		1.7	(0.3)
Other comprehensive income (loss) before reclassifications, net of tax	(39.9)	(12.0)	(28.6)	(11.7)
Reclassifications, before tax	8.5	1.5	12.8	3.8
Tax benefit (expense)	(2.4)	(0.4)	(3.4)	(0.9)
Reclassifications, net of tax	6.1	1.1	9.4	2.9
Other comprehensive (loss) income, net of tax	(33.8)	(10.9)	(19.2)	(8.8)
Ending Balance	944.5	944.9	944.5	944.9
Settlement charge	2.3	0.0	2.3	0.0
Accumulated other comprehensive loss	(212.1)		(212.1)		$ (192.9)
Reclassification
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated other comprehensive loss	7.9		7.9
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(178.3)	(147.7)	(192.9)	(149.8)
Other comprehensive (loss) income, net of tax	(33.8)	(10.9)	(19.2)	(8.8)
Ending Balance	(212.1)	(158.6)	(212.1)	(158.6)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(82.2)	(66.6)	(92.7)	(66.1)
Other comprehensive (loss) income before reclassifications and tax	(35.3)	(11.9)	(24.8)	(12.4)
Tax benefit (expense)	0.0		0.0	0.0
Other comprehensive income (loss) before reclassifications, net of tax	(35.3)	(11.9)	(24.8)	(12.4)
Reclassifications, before tax	0.0	0.0	0.0	0.0
Tax benefit (expense)	0.0	0.0	0.0	0.0
Reclassifications, net of tax	0.0	0.0	0.0	0.0
Other comprehensive (loss) income, net of tax	(35.3)	(11.9)	(24.8)	(12.4)
Ending Balance	(117.5)	(78.5)	(117.5)	(78.5)
Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	(97.0)	(80.8)	(99.0)	(82.9)
Other comprehensive (loss) income before reclassifications and tax	(7.9)	0.0	(7.9)	0.0
Tax benefit (expense)	1.9		1.9	0.0
Other comprehensive income (loss) before reclassifications, net of tax	(6.0)	0.0	(6.0)	0.0
Reclassifications, before tax	5.2	1.7	7.5	4.4
Tax benefit (expense)	(1.2)	(0.5)	(1.5)	(1.1)
Reclassifications, net of tax	4.0	1.2	6.0	3.3
Other comprehensive (loss) income, net of tax	(2.0)	1.2	0.0	3.3
Ending Balance	(99.0)	(79.6)	(99.0)	(79.6)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance	0.9	(0.3)	(1.2)	(0.8)
Other comprehensive (loss) income before reclassifications and tax	2.3	(0.1)	2.4	1.0
Tax benefit (expense)	(0.9)		(0.2)	(0.3)
Other comprehensive income (loss) before reclassifications, net of tax	1.4	(0.1)	2.2	0.7
Reclassifications, before tax	3.3	(0.2)	5.3	(0.6)
Tax benefit (expense)	(1.2)	0.1	(1.9)	0.2
Reclassifications, net of tax	2.1	(0.1)	3.4	(0.4)
Other comprehensive (loss) income, net of tax	3.5	(0.2)	5.6	0.3
Ending Balance	$ 4.4	$ (0.5)	$ 4.4	$ (0.5)