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Goodwill (Notes)
 6 Months Ended
Mar. 31, 2018
Goodwill [Abstract]  
Goodwill
GOODWILL
The changes in the carrying amount of goodwill by segment are noted in the following table.
 
Post Consumer Brands
 
Weetabix
 
Refrigerated Food
 
Active Nutrition
 
Private Brands
 
Total
Balance, September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Goodwill (gross)
$
1,999.6

 
$
926.9

 
$
1,231.6

 
$
180.7

 
$
417.1

 
$
4,755.9

Accumulated impairment losses
(609.1
)
 
—

 
—

 
(114.8
)
 
—

 
(723.9
)
Goodwill (net)
$
1,390.5

 
$
926.9

 
$
1,231.6

 
$
65.9

 
$
417.1

 
$
4,032.0

Goodwill acquired
—

 
—

 
894.5

 
—

 
—

 
894.5

Acquisition related adjustment
13.0

 
(1.6
)
 
—

 
—

 
—

 
11.4

Currency translation adjustment
(0.3
)
 
42.3

 
—

 
—

 
—

 
42.0

Balance, March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Goodwill (gross)
$
2,012.3

 
$
967.6

 
$
2,126.1

 
$
180.7

 
$
417.1

 
$
5,703.8

Accumulated impairment losses
(609.1
)
 
—

 
—

 
(114.8
)
 
—

 
(723.9
)
Goodwill (net)
$
1,403.2

 
$
967.6

 
$
2,126.1

 
$
65.9

 
$
417.1

 
$
4,979.9