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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes in accumulated other comprehensive loss, net for the six months ended March 31, 2018.
(in millions)
 
Foreign Currency Translation Adjustment
 
Pension Benefits Adjustment
 
Accumulated Other Comprehensive Loss
Balances as of September 30, 2017
 
$
(21.5
)
 
$
(3.0
)
 
$
(24.5
)
Other comprehensive loss, net of tax
 
(3.8
)
 
—

 
(3.8
)
Balances as of March 31, 2018
 
$
(25.3
)
 
$
(3.0
)
 
$
(28.3
)