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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Sep. 30, 2016
Liabilities    
Debt [1],[2] $ 6,032.5 $ 5,525.8
Level 2 [Member]    
Liabilities    
Total debt [1],[2] 6,191.3 5,700.1
Level 3 [Member]    
Fixed maturity securities, available-for-sale:    
Asset-backed loans [1] 1.7 33.3
Liabilities    
Total debt [1],[2]   29.9
Recurring [Member]    
Liabilities    
Liabilities, Fair Value Disclosure, Recurring 10.8 3.2
Assets, Fair Value Disclosure, Recurring 2.9 8.7
Recurring [Member] | Level 1 [Member]    
Liabilities    
Liabilities, Fair Value Disclosure, Recurring 0.0 0.0
Assets, Fair Value Disclosure, Recurring 0.0 0.0
Recurring [Member] | Level 2 [Member]    
Liabilities    
Liabilities, Fair Value Disclosure, Recurring 10.8 3.2
Assets, Fair Value Disclosure, Recurring 2.9 8.7
Recurring [Member] | Level 3 [Member]    
Liabilities    
Liabilities, Fair Value Disclosure, Recurring 0.0 0.0
Assets, Fair Value Disclosure, Recurring 0.0 0.0
Estimate of Fair Value Measurement [Member]    
Fixed maturity securities, available-for-sale:    
Asset-backed loans [1] 1.7 33.3
Liabilities    
Total debt [1],[2] 6,191.3 5,730.0
Reported Value Measurement [Member]    
Fixed maturity securities, available-for-sale:    
Asset-backed loans [1] 1.7 $ 33.3
Liabilities    
Total debt [1],[2] $ 6,032.5  
[1] The carrying value of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[2] The fair value of debt set forth above is generally based on quoted or observed market prices.