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Related Party Transactions (Tables)
 12 Months Ended
Sep. 30, 2017
Related Party Transactions [Abstract]  
Schedule of Total Costs Allocated
Total costs allocated to us in the consolidated income statements are summarized below:
 
Year Ended September 30,
 
2017
 
2016
 
2015
(In millions)
 
 
 
 
 
Cost of sales
$
—

 
$
2.8

 
$
3.6

Selling and administrative
—

 
16.8

 
17.8

Research and development
—

 
1.0

 
1.4

Business restructuring and cost reduction actions
—

 
0.7

 
3.5

Total Allocated Costs
$
—

 
$
21.3

 
$
26.3