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Accumulated Other Comprehensive Income (Loss) (Notes)
 9 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Accumulated Other Comprehensive Loss, Net
Comprehensive income consists of net income and other gains and losses affecting stockholders’ equity that, under U.S. GAAP, are excluded from net income. Other comprehensive loss includes net actuarial losses from defined benefit pension plans and foreign currency translation adjustments.
The following table summarizes the changes in accumulated other comprehensive loss, net for the nine months ended June 30, 2019.
(in millions)
 
Foreign Currency Translation Adjustment
 
Pension Benefits Adjustment
 
Accumulated Other Comprehensive Loss
Balances as of September 30, 2018
 
$
(30.5
)
 
$
(2.6
)
 
$
(33.1
)
Other comprehensive income
 
0.6

 
—

 
0.6

Balances as of June 30, 2019
 
$
(29.9
)
 
$
(2.6
)
 
$
(32.5
)