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Intangible Assets - (Notes)
 3 Months Ended
Dec. 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):
 
December 31, 2018
 
September 30, 2018
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
Software programs/platforms
$
2.7

 
$
(2.6
)
 
$
0.1

 
$
2.7

 
$
(2.6
)
 
$
0.1

Customer base
21.4

 
(10.8
)
 
10.6

 
21.4

 
(10.1
)
 
11.3

Total intangible assets
$
24.1

 
$
(13.4
)
 
$
10.7

 
$
24.1

 
$
(12.7
)
 
$
11.4


Amortization expense related to intangible assets was $0.6 million for the three months ended December 31, 2018 and 2017.
As of December 31, 2018, the estimated future amortization expense was as follows:
(in millions)
 
Fiscal 2019 (remaining nine months)
$
1.9

Fiscal 2020
2.2

Fiscal 2021
2.2

Fiscal 2022
1.0

Fiscal 2023 and thereafter
3.4

 
$
10.7