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Investments - Schedule of Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Document Fiscal Year Focus     2016  
Document Period End Date     Jun. 30, 2016  
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) $ 16.9 $ (9.4) $ 17.0 $ (26.6)
Allowance for credit losses:        
Balance at beginning of period 47.8 22.7 47.9 5.5
Provision for credit losses 11.7 (9.4) (2.7) (77.7)
Balance at end of period 33.8 32.1 33.8 32.1
Radioshack [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable, Allowance for Credit Losses, Write-downs (5.2) 0.0 (19.7) (51.1)
Financing Receivable, Allowance for Credit Losses, Recovery $ 2.9 $ 0.0 $ 2.9 0.0
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)       $ (19.2)