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Comprehensive Income (Tables)
6 Months Ended
Feb. 28, 2021
Equity [Abstract]  
Changes in each component of accumulated other comprehensive loss
The following tables summarize the changes in each component of accumulated other comprehensive loss during the periods presented (in millions):
 Foreign Currency Items Defined Benefit Pension Plans Accumulated Other Comprehensive Loss Items
Balance at August 31, 2020$(53.5)$(79.2)$(132.7)
Other comprehensive income before reclassifications11.3 — 11.3 
Amounts reclassified from accumulated other comprehensive loss (1)
— 3.3 3.3 
Net current period other comprehensive income11.3 3.3 14.6 
Balance at February 28, 2021$(42.2)$(75.9)$(118.1)
 Foreign Currency Items Defined Benefit Pension Plans Accumulated Other Comprehensive Loss Items
Balance at August 31, 2019$(65.4)$(86.0)$(151.4)
Other comprehensive loss before reclassifications(1.8)— (1.8)
Amounts reclassified from accumulated other comprehensive loss (1)
— 3.6 3.6 
Net current period other comprehensive (loss) income(1.8)3.6 1.8 
Balance at February 29, 2020$(67.2)$(82.4)$(149.6)
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(1) The before tax amounts of the defined benefit pension plan items are included in net periodic pension cost. See the Pension and Defined Contribution Plans footnote for additional details.
Schedule of tax expense or benefit allocated to each component of other comprehensive income (loss) The following table summarizes the tax expense or benefit allocated to each component of other comprehensive income (loss) for the periods presented (in millions):
Three Months Ended
February 28, 2021February 29, 2020
 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount
Foreign currency translation adjustments$6.7 $— $6.7 $(3.7)$— $(3.7)
Defined benefit pension plans:
Amortization of defined benefit pension items:
Prior service cost
0.7 (0.1)0.6 1.0 (0.3)0.7 
Actuarial losses1.3 (0.2)1.1 1.4 (0.4)1.0 
Total defined benefit pension plans, net2.0 (0.3)1.7 2.4 (0.7)1.7 
Other comprehensive income (loss)$8.7 $(0.3)$8.4 $(1.3)$(0.7)$(2.0)
Six Months Ended
February 28, 2021February 29, 2020
 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount
Foreign currency translation adjustments$11.3 $— $11.3 $(1.8)$— $(1.8)
Defined benefit pension plans:
Amortization of defined benefit pension items:
Prior service cost1.4 (0.3)1.1 2.0 (0.5)1.5 
Actuarial losses2.7 (0.5)2.2 2.8 (0.7)2.1 
Total defined benefit pension plans, net4.1 (0.8)3.3 4.8 (1.2)3.6 
Other comprehensive income$15.4 $(0.8)$14.6 $3.0 $(1.2)$1.8