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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Defined benefit pension plans - Net of Tax Amount      
Other comprehensive income before reclassifications $ (4.9) $ 8.9  
Other comprehensive (loss) income before tax (1.1) 14.5 $ (26.0)
Other comprehensive (loss) income, tax (1.2) (1.3) (1.6)
Other comprehensive (loss) income items, net of tax (2.3) 13.2 (27.6)
Foreign Currency Items      
Foreign currency translation adjustments - Before Tax Amount      
Foreign currency translation adjustments (5.9) 8.5 (33.3)
Foreign currency translation adjustments - Tax (Expense) or Benefit      
Foreign currency translation adjustments 0.0 0.0 0.0
Foreign currency translation adjustments - Net of Tax Amount      
Foreign currency translation adjustments (5.9) 8.5 (33.3)
Defined benefit pension plans - Net of Tax Amount      
Other comprehensive income before reclassifications (5.9) 8.5  
Other comprehensive (loss) income items, net of tax (5.9) 8.5  
Actuarial amounts      
Defined benefit pension plans - Before Tax Amounts      
Actuarial gains, before tax 1.4 0.4 0.7
Defined benefit pension plans - Tax (Expense) or Benefit      
Actuarial amounts (0.4) 0.0 0.0
Defined benefit pension plans - Net of Tax Amount      
Actuarial gains, after tax 1.0 0.4 0.7
Prior service cost      
Defined benefit pension plans - Before Tax Amounts      
Amortization of defined benefit pension items- Prior service cost 0.1 2.6 2.9
Defined benefit pension plans - Tax (Expense) or Benefit      
Amortization of defined benefit pension items- Prior service cost 0.0 (0.6) (0.7)
Defined benefit pension plans - Net of Tax Amount      
Amortization of defined benefit pension items- Prior service cost 0.1 2.0 2.2
Actuarial losses      
Defined benefit pension plans - Before Tax Amounts      
Amortization of defined benefit pension items - Actuarial losses 3.3 3.0 3.3
Defined benefit pension plans - Tax (Expense) or Benefit      
Amortization of defined benefit pension items- Actuarial losses (0.8) (0.7) (0.8)
Defined benefit pension plans - Net of Tax Amount      
Amortization of defined benefit pension items- Actuarial losses 2.5 2.3 2.5
Settlement losses      
Defined benefit pension plans - Before Tax Amounts      
Amortization of defined benefit pension items- Settlement losses 0.0 0.0 0.4
Defined benefit pension plans - Tax (Expense) or Benefit      
Amortization of defined benefit pension items - Settlement losses 0.0 0.0 (0.1)
Defined benefit pension plans - Net of Tax Amount      
Amortization of defined benefit pension items- Settlement losses 0.0 0.0 0.3
Defined Benefit Pension Plans      
Defined benefit pension plans - Before Tax Amounts      
Total defined benefit plans, net - before tax 4.8 6.0 7.3
Defined benefit pension plans - Tax (Expense) or Benefit      
Total defined benefit plans, net - tax (1.2) (1.3) (1.6)
Defined benefit pension plans - Net of Tax Amount      
Other comprehensive income before reclassifications 1.0 0.4  
Total defined benefit plans, net - net of tax 3.6 4.7 $ 5.7
Other comprehensive (loss) income items, net of tax $ 3.6 $ 4.7