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Segment Data - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Segment
Jun. 30, 2014
USD ($)
Segment Reporting Information [Line Items]        
Asset Impairment Charges $ 113.9 $ (0.3) $ 613.4 $ 82.5
Number of reporting segments     4  
Insurance Segment [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges $ 16.2   $ 58.6  
Asset Management segment [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges     72.2  
Radioshack [Member] | Insurance Segment [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges     40.0  
Radioshack [Member] | Asset Management segment [Member]        
Segment Reporting Information [Line Items]        
Asset Impairment Charges     $ 24.8