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Acquisitions (Tables)
12 Months Ended
Sep. 30, 2012
Business Combinations [Abstract]  
Pro Forma Financial Information
Unaudited Pro Forma Financial Information
 
 
Year ended September 30,
 
2011
 
2010
 
(in millions, except per share amounts)
Revenue
$
1,227.8

 
$
1,075.3

Net income
$
93.0

 
$
26.0

Earnings per share—Basic
$
0.79

 
$
0.22

Earnings per share—Diluted
$
0.77

 
$
0.22