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Investments - Schedule of Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Allowance for credit losses:        
Balance at beginning of period $ 33.8 $ 7.0 $ 7.2 $ 5.2
Provision for credit losses 10.6 (0.3) 113.8 1.5
Balance at end of period $ 44.4 $ 6.7 $ 44.4 $ 6.7