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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures
Supplemental cash flow information is presented below.
 
September 30,
 
2016
 
2015
 
2014
 
(in millions)
Cash paid, net:
 
 
 
 
 
Interest
$
21.1

 
$
36.8

 
$
48.7

Income taxes
$
36.9

 
$
13.3

 
$
2.6