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Accumulated Other Comprehensive Income (Loss) (Notes)
 12 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Accumulated Other Comprehensive Income (Loss)
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 income (loss) includes net actuarial gains from defined benefit pension plans and losses on foreign currency translations.
The following table summarizes the changes in accumulated other comprehensive income (loss) for the year ended September 30, 2017.
(in millions)
 
Foreign Currency Translation Adjustment
 
Pension Benefits Adjustment
 
Accumulated Other Comprehensive Loss
Balances as of September 30, 2016
 
$
(20.1
)
 
$
(4.5
)
 
$
(24.6
)
Other comprehensive income (loss), net of tax before reclassifications
 
(1.4
)
 
1.2

 
(0.2
)
Amounts reclassified from AOCI, net of tax
 
—

 
0.3

 
0.3

Other comprehensive income (loss), net of tax
 
(1.4
)
 
1.5

 
0.1

Balances as of September 30, 2017
 
$
(21.5
)
 
$
(3.0
)
 
$
(24.5
)