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Comprehensive Income (Tables)
 3 Months Ended
Nov. 30, 2018
Equity [Abstract]  
Changes in components of accumulated other comprehensive income (loss) items
The following table presents the changes in each component of accumulated other comprehensive loss during the three months ended November 30, 2018 and 2017 (in millions):
 
 Foreign Currency Items
 
 Defined Benefit Pension Plans
 
 Accumulated Other Comprehensive Loss Items
Balance at August 31, 2018
$
(53.9
)
 
$
(60.9
)
 
$
(114.8
)
Other comprehensive (loss) income before reclassifications
(8.8
)
 
0.9

 
(7.9
)
Amounts reclassified from accumulated other comprehensive loss
—

 
1.7

 
1.7

Net current period other comprehensive (loss) income
(8.8
)
 
2.6

 
(6.2
)
Balance at November 30, 2018
$
(62.7
)
 
$
(58.3
)
 
$
(121.0
)

 
 Foreign Currency Items
 
 Defined Benefit Pension Plans
 
 Accumulated Other Comprehensive Loss Items
Balance at August 31, 2017
$
(28.7
)
 
$
(71.0
)
 
$
(99.7
)
Other comprehensive loss before reclassifications
(10.5
)
 
—

 
(10.5
)
Amounts reclassified from accumulated other comprehensive loss
—

 
1.6

 
1.6

Net current period other comprehensive (loss) income
(10.5
)
 
1.6

 
(8.9
)
Balance at November 30, 2017
$
(39.2
)

$
(69.4
)

$
(108.6
)
Schedule of comprehensive income (loss)
The following table presents the tax expense or benefit allocated to each component of other comprehensive income (loss) for the three months ended November 30, 2018 and 2017 (in millions):
 
Three Months Ended
 
November 30, 2018
 
November 30, 2017
 
 Before Tax Amount
 
 Tax (Expense) Benefit
 
 Net of Tax Amount
 
 Before Tax Amount
 
 Tax (Expense) Benefit
 
 Net of Tax Amount
Foreign currency translation adjustments
$
(8.8
)
 
$
—

 
$
(8.8
)
 
$
(10.5
)
 
$
—

 
$
(10.5
)
Defined benefit pension plans:
 
 
 
 
 
 
 
 
 
 
 
Actuarial gain or loss
1.3

 
(0.4
)
 
0.9

 
—

 
—

 
—

Amortization of defined benefit pension items:
 
 
 
 
 
 
 
 
 
 
 
Prior service cost 
0.8

 
(0.2
)
 
0.6

 
0.8

 
(0.3
)
 
0.5

Actuarial losses
1.1

 
(0.3
)
 
0.8

 
1.7

 
(0.6
)
 
1.1

Settlement losses
0.4

 
(0.1
)
 
0.3

 
—

 
—

 
—

Total defined benefit pension plans, net
3.6

 
(1.0
)
 
2.6

 
2.5

 
(0.9
)
 
1.6

Other comprehensive loss
$
(5.2
)
 
$
(1.0
)
 
$
(6.2
)
 
$
(8.0
)
 
$
(0.9
)
 
$
(8.9
)