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Comprehensive Income - Tax Amounts Allocated to Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss), before tax $ 6.7 $ 4.3
Other comprehensive income (loss), tax (0.5) (0.5)
Other comprehensive income items, net of tax 6.2 3.8
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss), before tax 4.6 1.9
Other comprehensive income (loss), tax 0.0 0.0
Other comprehensive income items, net of tax 4.6 1.9
Prior service cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of defined benefit pension items, before tax 0.7 1.0
Amortization of defined benefit pension items, tax (0.2) (0.2)
Amortization of defined benefit pension items, after tax 0.5 0.8
Actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of defined benefit pension items, before tax 1.4 1.4
Amortization of defined benefit pension items, tax (0.3) (0.3)
Amortization of defined benefit pension items, after tax 1.1 1.1
Total defined benefit pension plans, net    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss), before tax 2.1 2.4
Other comprehensive income (loss), tax (0.5) (0.5)
Other comprehensive income items, net of tax $ 1.6 $ 1.9