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Comprehensive Income (Tables)
3 Months Ended
Nov. 30, 2020
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)$(132.7)
Other comprehensive income before reclassifications4.6 — 4.6 
Amounts reclassified from accumulated other comprehensive loss (1)
— 1.6 1.6 
Net current period other comprehensive income4.6 1.6 6.2 
Balance at November 30, 2020$(48.9)$(77.6)$(126.5)
 Foreign Currency Items Defined Benefit Pension Plans Accumulated Other Comprehensive Loss Items
Balance at August 31, 2019$(65.4)$(86.0)$(151.4)
Other comprehensive income before reclassifications1.9 — 1.9 
Amounts reclassified from accumulated other comprehensive loss (1)
— 1.9 1.9 
Net current period other comprehensive income1.9 1.9 3.8 
Balance at November 30, 2019$(63.5)$(84.1)$(147.6)
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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
November 30, 2020November 30, 2019
 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount
Foreign currency translation adjustments$4.6 $— $4.6 $1.9 $— $1.9 
Defined benefit pension plans:
Amortization of defined benefit pension items:
Prior service cost
0.7 (0.2)0.5 1.0 (0.2)0.8 
Actuarial losses1.4 (0.3)1.1 1.4 (0.3)1.1 
Total defined benefit pension plans, net2.1 (0.5)1.6 2.4 (0.5)1.9 
Other comprehensive income$6.7 $(0.5)$6.2 $4.3 $(0.5)$3.8