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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Foreign currency translation adjustments - Before Tax Amount      
Foreign currency translation adjustments $ 11.9 $ (11.5) $ (25.2)
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 11.9 (11.5) (25.2)
Defined benefit pension plans - Before Tax Amounts      
Actuarial (losses) gains (0.7) (40.8) 18.4
Amortization of Defined benefit pension items - Prior service cost 4.0 3.5 3.1
Amortization of Defined benefit pension items - Actuarial losses 5.6 4.1 6.8
Amortization of Defined benefit pension items - Settlement losses 0.0 0.4 0.0
Total defined benefit plans, net - before tax 8.9 (32.8) 28.3
Defined benefit pension plans - Tax (Expense) or Benefit      
Actuarial (losses) gains 0.1 9.7 (4.4)
Amortization of Defined benefit pension items - Prior service cost (0.9) (0.9) (0.7)
Amortization of Defined benefit pension items - Actuarial losses (1.3) (1.0) (2.0)
Amortization of Defined benefit pension items - Settlement losses 0.0 (0.1) 0.0
Total defined benefit plans, net - tax (2.1) 7.7 (7.1)
Defined benefit pension plans - Net of Tax Amount      
Actuarial (losses) gains (0.6) (31.1) 14.0
Amortization of Defined benefit pension items - Prior service cost 3.1 2.6 2.4
Amortization of Defined benefit pension items - Actuarial losses 4.3 3.1 4.8
Amortization of Defined benefit pension items - Settlement losses 0.0 0.3 0.0
Total defined benefit plans, net - net of tax 6.8 (25.1) 21.2
Other comprehensive income (loss) before tax 20.8 (44.3) 3.1
Other comprehensive income (loss), tax (2.1) 7.7 (7.1)
Other comprehensive income (loss) items, net of tax $ 18.7 $ (36.6) $ (4.0)