Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 778.7	$ 1,002.4	$ 1,085.2
Net other comprehensive loss	(43.6)	(116.2)	(8.3)
Ending Balance	771.4	778.7	1,002.4
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(70.8)	48.3
Other comprehensive loss before reclassifications and tax	(18.5)	(119.1)
Tax benefit	0.0	0.0
Other comprehensive loss before reclassifications, net of tax	(18.5)	(119.1)
Reclassifications, before tax	0.0	0.0
Tax expense	0.0	0.0
Reclassifications, net of tax	0.0	0.0
Net other comprehensive loss	(18.5)	(119.1)
Ending Balance	(89.3)	(70.8)	48.3
Pension benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(90.6)	(94.0)
Other comprehensive loss before reclassifications and tax	(55.4)	(5.2)
Tax benefit	19.4	2.0
Other comprehensive loss before reclassifications, net of tax	(36.0)	(3.2)
Reclassifications, before tax	15.8	8.7
Tax expense	(5.0)	(2.1)
Reclassifications, net of tax	10.8	6.6
Net other comprehensive loss	(25.2)	3.4
Ending Balance	(115.8)	(90.6)	(94.0)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(0.6)	(0.1)
Other comprehensive loss before reclassifications and tax	(0.4)	(1.9)
Tax benefit	0.1	0.7
Other comprehensive loss before reclassifications, net of tax	(0.3)	(1.2)
Reclassifications, before tax	0.6	1.0
Tax expense	(0.2)	(0.3)
Reclassifications, net of tax	0.4	0.7
Net other comprehensive loss	0.1	(0.5)
Ending Balance	(0.5)	(0.6)	(0.1)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(162.0)	(45.8)	(37.5)
Other comprehensive loss before reclassifications and tax	(74.3)	(126.2)
Tax benefit	19.5	2.7
Other comprehensive loss before reclassifications, net of tax	(54.8)	(123.5)
Reclassifications, before tax	16.4	9.7
Tax expense	(5.2)	(2.4)
Reclassifications, net of tax	11.2	7.3
Net other comprehensive loss	(43.6)	(116.2)
Ending Balance	$ (205.6)	$ (162.0)	$ (45.8)