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Reinsurance (Tables)
 6 Months Ended
Mar. 31, 2013
Reinsurance Disclosures [Abstract]  
Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes
The effect of reinsurance on premiums earned, benefits incurred and reserve changes were as follows:
 
Three months ended
 
Six months ended
 
March 31, 2013
 
April 1, 2012
 
March 31, 2013
 
April 1, 2012
 
Insurance Premiums
 
Benefits and Other Changes in Insurance Policy Reserves
 
Insurance Premiums
 
Benefits and Other Changes in Insurance Policy Reserves
 
Insurance Premiums
 
Benefits and Other Changes in Insurance Policy Reserves
 
Insurance Premiums
 
Benefits and Other Changes in Insurance Policy Reserves
Direct
$
70.0

 
$
289.3

 
$
75.0

 
$
287.1

 
$
142.4

 
$
428.9

 
$
151.2

 
$
524.8

Assumed
3.3

 
1.0

 
12.1

 
9.5

 
15.4

 
7.5

 
24.3

 
18.0

Ceded
(59.2
)
 
(49.4
)
 
(73.8
)
 
(54.8
)
 
(129.9
)
 
(111.9
)
 
(145.4
)
 
(124.1
)
Net
$
14.1

 
$
240.9

 
$
13.3

 
$
241.8

 
$
27.9

 
$
324.5

 
$
30.1

 
$
418.7