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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Schedule of Reconciliation of Basic Average Common Shares Outstanding to Diluted Average Common Shares Outstanding
A reconciliation of basic average common shares outstanding to diluted average common shares outstanding is as follows (in millions):
 
 
Year Ended September 30,
 
2015
 
2014
 
2013
Basic average common shares outstanding
96.9

 
97.5

 
97.1

Impact of stock options
0.1

 
0.1

 
—

Impact of restricted shares, restricted share units and performance share units
2.0

 
1.6

 
—

Impact of convertible notes
1.1

 
—

 
—

Diluted average common shares outstanding
100.1

 
99.2

 
97.1