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Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 8.3 $ 18.4 $ 20.4
Interest cost 13.5 18.9 19.1
Expected return on assets (26.4) (28.8) (29.5)
Prior service cost and transition amortization 0.6 0.8 0.6
Actuarial loss amortization 7.3 8.5 7.1
Settlement loss 0.0 0.0 3.9
Net periodic benefit costs 3.3 17.8 21.6
Other changes recognized in other comprehensive income:      
Net actuarial (gain) loss (21.7) 53.6 3.5
Amortization of asset obligations (0.2) (0.4) (0.2)
Amortization of prior service cost (0.4) (0.4) (0.4)
Amortization of net actuarial loss (7.3) (8.5) (11.0)
Total recognized in other comprehensive income (29.6) 44.3 (8.1)
Total recognized in net periodic benefit costs and other comprehensive income $ (26.3) $ 62.1 $ 13.5