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Goodwill (Tables)
6 Months Ended
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in carrying amount of goodwill
The changes in the carrying amount of goodwill by segment are noted in the following table.
 
Post Foods
 
Attune Foods
 
Active Nutrition
 
Private Brands
 
Total
Balance, September 30, 2013
 
 
 
 
 
 
 
 
 
Goodwill (gross)
$
1,794.1

 
$
75.1

 
$
48.3

 
$

 
$
1,917.5

Accumulated impairment losses
(427.8
)
 

 

 

 
(427.8
)
Goodwill (net)
$
1,366.3

 
$
75.1

 
$
48.3

 
$

 
$
1,489.7

Goodwill acquired

 

 
102.3

 
318.8

 
421.1

Purchase price true-up adjustment

 

 
(1.1
)
 

 
(1.1
)
Currency translation adjustment
(0.4
)
 

 

 
1.5

 
1.1

Balance, March 31, 2014
 
 
 
 
 
 
 
 
 
Goodwill (gross)
$
1,793.7

 
$
75.1

 
$
149.5

 
$
320.3

 
$
2,338.6

Accumulated impairment losses
(427.8
)
 

 

 

 
(427.8
)
Goodwill (net)
$
1,365.9

 
$
75.1

 
$
149.5

 
$
320.3

 
$
1,910.8