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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Derivatives, Fair Value [Line Items]    
Document Period End Date Jun. 30, 2016  
Funds Withheld Receivable $ 1,661.0 $ 1,710.1
FIA embedded derivatives [Member] | Contractholder funds [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 133.5 142.3
Derivatives designated as hedging instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 8.8 5.6
Total liability derivatives 4.0 9.6
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Accounts payable and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 1.3 1.4
Derivatives designated as hedging instruments [Member] | Interest Rate Contract [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 0.5 1.2
Derivatives designated as hedging instruments [Member] | Commodity Swap And Option Agreements [Member] | Receivables, net [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 1.3 0.0
Derivatives designated as hedging instruments [Member] | Commodity Swap And Option Agreements [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0.3 0.0
Derivatives designated as hedging instruments [Member] | Foreign Exchange Forward [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0.6 0.4
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 6.6 5.2
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Accounts payable and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 1.7 1.5
Derivatives designated as hedging instruments [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 0.1 0.0
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 0.4 4.7
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 0.0 0.8
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 23.4 20.3
Total liability derivatives 139.7 152.1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accounts payable and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 0.6 0.1
Not Designated as Hedging Instrument [Member] | Call options [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 4.5 1.0
Not Designated as Hedging Instrument [Member] | Call options [Member] | Funds withheld for reinsurance liability [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 9.4 5.4
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Receivables, net [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0.4 0.4
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Receivables, net [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0.3 7.9
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 1.6 0.1
Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Funds Withheld Receivable 1,661.0 1,710.1
Assets, Fair Value Disclosure, Recurring 1,684.4 1,780.1
Liabilities, Fair Value Disclosure, Recurring 748.6 781.3
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 13.9 6.4
Fair Value, Measurements, Recurring [Member] | Commodity Option [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 1.9 7.9
Derivative Liability 2.0 5.6
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.4 1.6
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 1.8 2.6
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Funds Withheld Receivable 143.0 45.8
Assets, Fair Value Disclosure, Recurring 143.0 78.6
Liabilities, Fair Value Disclosure, Recurring 0.0 0.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 0.0 0.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 133.5 142.3
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability   0.0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Funds Withheld Receivable 1,443.3 1,579.9
Assets, Fair Value Disclosure, Recurring 1,466.7 1,600.2
Liabilities, Fair Value Disclosure, Recurring 6.2 9.8
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 13.9 6.4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Option [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 1.9 7.9
Derivative Liability 2.0 5.6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.4 1.6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 1.8 2.6
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Funds Withheld Receivable 74.7 84.4
Assets, Fair Value Disclosure, Recurring 74.7 101.3
Liabilities, Fair Value Disclosure, Recurring 742.4 771.5
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivatives 0.0 0.0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability 133.5 142.3
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Available-for-sale Securities 0.0 14.1
Corporate Debt Securities [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Available-for-sale Securities 0.0 0.0
Corporate Debt Securities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Available-for-sale Securities 0.0 14.1
Equity [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Trading Securities 0.0 32.8
Equity [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Trading Securities 0.0 32.8
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Other invested assets 0.0 2.8
Other Invested Assets [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Other invested assets 0.0 0.0
Other Invested Assets [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Other invested assets 0.0  
Other Invested Assets [Member] | Option Pricing [Member] | Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Derivatives, Fair Value [Line Items]    
Other invested assets   2.8
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 608.9 $ 629.2