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Intangible Assets - (Notes)
 6 Months Ended
Mar. 31, 2018
Intangible Assets [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible Assets
The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions):
 
March 31, 2018
 
September 30, 2017
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
Software programs/platforms
2.7

 
(2.5
)
 
0.2

 
2.7

 
(2.5
)
 
0.2

Customer base
20.0

 
(9.0
)
 
11.0

 
20.0

 
(7.9
)
 
12.1

Total intangible assets
$
22.7

 
$
(11.5
)
 
$
11.2

 
$
22.7

 
$
(10.4
)
 
$
12.3


Amortization expense related to intangible assets was $1.1 million and $1.4 million for the six months ended March 31, 2018 and 2017, respectively.
As of March 31, 2018, the estimated future amortization expense was as follows:
(in millions)
 
Fiscal 2018 (remaining six months)
$
1.1

Fiscal 2019
2.2

Fiscal 2020
2.0

Fiscal 2021
1.9

Fiscal 2022 and thereafter
4.0

 
$
11.2