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Accumulated Other Comprehensive Loss
 6 Months Ended
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated other comprehensive loss is presented below.
 
  Pension, net of tax
 
Foreign currency translation
 
Total
 
(in millions)
Balance at September 30, 2018
$
(26.5
)
 
$
(6.3
)
 
$
(32.8
)
Current period other comprehensive income (loss)
1.9

 
3.1

 
$
5.0

Balance at March 31, 2019
$
(24.6
)
 
$
(3.2
)
 
$
(27.8
)