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Other (Expense) Income, Net
 12 Months Ended
Sep. 30, 2017
Other Nonoperating Income (Expense) [Abstract]  
Other (Expense) Income, Net
Other (Expense) Income, Net
 
 
Year Ended September 30,
 
2017
 
2016
 
2015
Equity in net income (loss) of affiliates
$
(0.4
)
 
$
0.3

 
$
(2.1
)
Foreign currency exchange gain (loss), net
(1.4
)
 
0.3

 
(4.4
)
Other, net
(2.4
)
 
(2.3
)
 
(1.4
)
Other (expense) income, net
$
(4.2
)
 
$
(1.7
)
 
$
(7.9
)