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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2013
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ (34.5) $ (53.0) [1] $ (15.4) [2] $ (23.9) [3]      
Assets              
Cash and cash equivalents $ 1,197.0   1,197.0 1,319.2 $ 1,319.2 $ 1,899.7 $ 1,470.7
Derivatives, Assets              
Derivatives     81.9 296.3      
Fixed maturity securities, available-for-sale:              
Asset Backed Loans And Other Invested Assets     335.8 811.6      
Other invested assets     39.6 28.8      
Assets, Fair Value Disclosure     1,233.1 1,066.0      
Asset-backed securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   (10.5) [1] (10.4) [2] (3.8) [3]      
Commercial mortgage-backed securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0.0 [1]   (6.0) [3]      
Corporates              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   (33.8) [1] (24.1) [2] (14.1) [3]      
Hybrids              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [1]   (8.7)          
Municipals              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [2]     0.0        
Other invested assets              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     19.1 [2] 0.0 [3]      
Equity Securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     0.0 [2] 0.0 [3]      
Estimate of Fair Value Measurement [Member]              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]       15.5      
Asset Backed Loans And Other Invested Assets [4]     335.8        
Liabilities              
Debt Instrument, Fair Value Disclosure [4],[5]     6,514.3 5,308.5      
Derivatives, Liabilities              
Liabilities Related to Investment Contracts, Fair Value Disclosure [4]     14,125.7 13,108.8      
Reported Value Measurement [Member]              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]       15.5      
Asset Backed Loans And Other Invested Assets [4]     335.8        
Liabilities              
Debt Instrument, Fair Value Disclosure [4],[5]     6,382.7 5,157.8      
Derivatives, Liabilities              
Liabilities Related to Investment Contracts, Fair Value Disclosure [4]     15,620.4 14,555.4      
Commercial mortgage loans | Estimate of Fair Value Measurement [Member]              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]     26.4        
Asset Backed Loans And Other Invested Assets [4]       811.6      
Commercial mortgage loans | Reported Value Measurement [Member]              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]     26.6        
Asset Backed Loans And Other Invested Assets [4]       811.6      
Fair Value, Inputs, Level 2 [Member]              
Liabilities              
Debt Instrument, Fair Value Disclosure [4],[5]     6,492.0 5,308.5      
Fair Value, Inputs, Level 3 [Member]              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]       15.5      
Asset Backed Loans And Other Invested Assets [4]     335.8        
Liabilities              
Debt Instrument, Fair Value Disclosure [4],[5]     22.3        
Derivatives, Liabilities              
Liabilities Related to Investment Contracts, Fair Value Disclosure [4]     14,125.7 13,108.8      
Fair Value, Inputs, Level 3 [Member] | Commercial mortgage loans              
Fixed maturity securities, available-for-sale:              
Policy loans and other invested assets [4]     26.4        
Asset Backed Loans And Other Invested Assets [4]       811.6      
Fair Value, Measurements, Recurring              
Assets              
Contingent Purchase Price Reduction Receivable Fair Value Disclosure     0.0 41.5      
Fixed maturity securities, available-for-sale:              
Funds Withheld Receivable [6]     652.3 154.4      
Fair Value, Measurements, Recurring | Asset-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,860.5 1,792.9      
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     882.2 636.9      
Fair Value, Measurements, Recurring | Corporates              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     9,544.7 9,795.8      
Fair Value, Measurements, Recurring | Hybrids              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,213.3 1,316.1      
Fair Value, Measurements, Recurring | Municipals              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,607.6 1,259.8      
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     2,162.5 2,114.0      
Fair Value, Measurements, Recurring | Interest Rate Contract [Member]              
Derivatives, Assets              
Derivatives     0.0 0.6      
Fair Value, Measurements, Recurring | Foreign exchange forward agreements              
Derivatives, Liabilities              
Derivative Liability     1.6 0.1      
Fair Value, Measurements, Recurring | Commodity Option [Member]              
Derivatives, Assets              
Derivatives     7.9 3.2      
Derivatives, Liabilities              
Derivative Liability     5.6 0.4      
Fair Value, Measurements, Recurring | Call options              
Derivatives, Assets              
Derivatives     81.9 296.3      
Fair Value, Measurements, Recurring | Available-for-sale embedded derivatives              
Fixed maturity securities, available-for-sale:              
Equity securities - available-for-sale     616.6 663.6      
Fair Value, Measurements, Recurring | FIA embedded derivatives, included in contractholder funds              
Derivatives, Liabilities              
Derivative Liability     2,149.4 1,908.1      
Fair Value, Measurements, Recurring | Future contracts              
Derivatives, Liabilities              
Derivative Liability       0.5      
Fair Value, Measurements, Recurring | Interest Rate Swap [Member]              
Derivatives, Liabilities              
Derivative Liability     2.6 1.8      
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member]              
Fixed maturity securities, available-for-sale:              
Assets, Fair Value Disclosure, Recurring     18,925.3 18,501.7      
Derivatives, Liabilities              
Liabilities, Fair Value Disclosure, Recurring     2,788.4 2,062.2      
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement [Member] | Front Street Future Policyholder Benefits Reserve [Member]              
Derivatives, Liabilities              
Derivative Liability     629.2 151.3      
Fair Value, Measurements, Recurring | Foreign exchange contracts | Foreign exchange forward agreements              
Derivatives, Assets              
Derivatives     6.0 12.8      
Fair Value, Measurements, Recurring | Equity securities              
Fixed maturity securities, available-for-sale:              
Trading Securities     32.8 104.5      
Fair Value, Measurements, Recurring | Fixed Maturities Securities | Estimate of Fair Value Measurement [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Cash and Cash Equivalents, Fair Value Disclosure [4]     1,197.0 1,319.2      
Fair Value, Measurements, Recurring | Fixed Maturities Securities | Reported Value Measurement [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Cash and Cash Equivalents, Fair Value Disclosure [4]     1,197.0 1,319.2      
Fair Value, Measurements, Recurring | Other invested assets              
Fixed maturity securities, available-for-sale:              
Other invested assets     13.0 13.3      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1              
Fixed maturity securities, available-for-sale:              
Funds Withheld Receivable [6]     32.8 0.0      
Assets, Fair Value Disclosure, Recurring     152.1 279.3      
Derivatives, Liabilities              
Liabilities, Fair Value Disclosure, Recurring     0.0 0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Municipals              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities       0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Available-for-sale embedded derivatives              
Fixed maturity securities, available-for-sale:              
Equity securities - available-for-sale     26.5 59.2      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Front Street Future Policyholder Benefits Reserve [Member]              
Derivatives, Liabilities              
Derivative Liability       0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Equity securities              
Fixed maturity securities, available-for-sale:              
Trading Securities     32.8 104.5      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Fixed Maturities Securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Cash and Cash Equivalents, Fair Value Disclosure [4]     1,197.0 1,319.2      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other invested assets              
Fixed maturity securities, available-for-sale:              
Other invested assets     0.0 0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]              
Fixed maturity securities, available-for-sale:              
Funds Withheld Receivable [6]     600.3 154.4      
Assets, Fair Value Disclosure, Recurring     17,540.1 17,156.4      
Derivatives, Liabilities              
Liabilities, Fair Value Disclosure, Recurring     9.8 2.8      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,850.4 1,755.9      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commercial mortgage-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     738.6 553.8      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Corporates              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     8,566.5 8,945.8      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Hybrids              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,213.3 1,316.1      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Municipals              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     1,569.1 1,222.6      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     2,162.5 2,114.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]              
Derivatives, Assets              
Derivatives     0.0 0.6      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange forward agreements              
Derivatives, Liabilities              
Derivative Liability     1.6 0.1      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commodity Option [Member]              
Derivatives, Assets              
Derivatives     7.9 3.2      
Derivatives, Liabilities              
Derivative Liability     5.6 0.4      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Call options              
Derivatives, Assets              
Derivatives     81.9 296.3      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Available-for-sale embedded derivatives              
Fixed maturity securities, available-for-sale:              
Equity securities - available-for-sale     559.6 598.4      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Future contracts              
Derivatives, Liabilities              
Derivative Liability       0.5      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]              
Derivatives, Liabilities              
Derivative Liability     2.6 1.8      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contracts | Foreign exchange forward agreements              
Derivatives, Assets              
Derivatives     6.0 12.8      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Fixed Maturities Securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Cash and Cash Equivalents, Fair Value Disclosure [4]     0.0 0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Other invested assets              
Fixed maturity securities, available-for-sale:              
Other invested assets       2.1      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]              
Fixed maturity securities, available-for-sale:              
Funds Withheld Receivable [6]     19.2 0.0      
Assets, Fair Value Disclosure, Recurring     1,233.1 1,066.0      
Derivatives, Liabilities              
Liabilities, Fair Value Disclosure, Recurring     2,778.6 2,059.4      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     10.1 37.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     143.6 83.1      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Corporates              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     978.2 850.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Hybrids              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     0.0 0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contracts | Foreign exchange forward agreements              
Derivatives, Assets              
Derivatives       0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities Securities              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Cash and Cash Equivalents, Fair Value Disclosure [4]     0.0 0.0      
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Other invested assets | Other invested assets              
Fixed maturity securities, available-for-sale:              
Other invested assets     13.0        
Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | FIA embedded derivatives, included in contractholder funds              
Derivatives, Liabilities              
Derivative Liability     2,149.4 1,908.1      
Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member]              
Derivatives, Liabilities              
Derivative Liability     629.2 151.3      
Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Other invested assets | Other invested assets              
Fixed maturity securities, available-for-sale:              
Other invested assets     2.8 0.0      
Broker Quoted [Member] | Corporates              
Fixed maturity securities, available-for-sale:              
Assets, Fair Value Disclosure     911.7 848.0      
Broker Quoted [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     10.1        
Broker Quoted [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     143.6        
Broker Quoted [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     38.5        
Broker Quoted [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Available-for-sale embedded derivatives | Equity Securities              
Fixed maturity securities, available-for-sale:              
Equity securities - available-for-sale     6.0 6.0      
Market Pricing [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities       37.2      
Matrix Pricing [Member] | Corporates              
Fixed maturity securities, available-for-sale:              
Assets, Fair Value Disclosure     66.5 2.0      
Matrix Pricing [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] | Available-for-sale embedded derivatives | Equity Securities              
Fixed maturity securities, available-for-sale:              
Equity securities - available-for-sale     30.5        
U.S. Government | Fair Value, Measurements, Recurring              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     244.0 296.0      
U.S. Government | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     60.0 115.6      
U.S. Government | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]              
Fixed maturity securities, available-for-sale:              
Available-for-sale Securities     184.0 180.4      
Contingent Purchase Price Reduction Receivable [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [1]   $ 0.0          
Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]              
Assets              
Contingent Purchase Price Reduction Receivable Fair Value Disclosure       $ 41.5      
Contingent Purchase Price Reduction Receivable [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]              
Assets              
Contingent Purchase Price Reduction Receivable Fair Value Disclosure     $ 0.0        
[1] (a) The net transfers out of Level 3 during Fiscal 2013 were exclusively to Level 2.
[2] (a) During Fiscal 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[3] (a) The net transfers in and out of Level 3 during Fiscal 2014 were exclusively to or from Level 2.
[4] (a)The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[5] (b)The fair values of debt set forth above are generally based on quoted or observed market prices.
[6] (a) included in “Other assets” in the Consolidated Balance Sheets.