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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Document Period End Date     Mar. 31, 2017          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 49.1 $ 64.5 $ 49.1 $ 64.5 $ 46.4 $ 78.1 $ 65.1 $ 91.6
Assets                
Cash and cash equivalents 320.3 457.5 320.3 457.5   497.3   661.2
Liabilities                
Debt 5,623.9   5,623.9     5,430.9 [1],[2]    
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (0.3) (1.3) 0.3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 6.1 3.1 9.1 8.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1.0) (3.4) (7.3) (30.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       (5.5)        
Net transfer In (Out) of Level 3 (a) (2.4) [3]   (29.5) [4]          
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 782.2 790.5 782.2 790.5 755.7 763.0 768.9 771.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 20.9 20.5 (1.7) 14.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 5.6 1.1 20.9 (4.6)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0.0 [3] 0.0 0.0 [4] 0.0        
Funds Withheld Receivable 1,634.2   1,634.2     1,650.4    
Corporate Debt Securities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value               14.1
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       (0.5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       (13.6)        
Other Invested Assets [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   0.0   0.0       2.8
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       2.7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)       0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       (5.5)        
Net transfer In (Out) of Level 3 (a)       0.0        
Level 2 [Member]                
Liabilities                
Total debt [1],[2] 5,867.8   5,867.8     5,700.1    
Level 3 [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [1] 8.3   8.3     8.5    
Asset-backed loans [1] 6.3   6.3     35.0    
Liabilities                
Total debt [1],[2] 10.1   10.1     29.1    
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 882.6   882.6     922.9    
Recurring [Member]                
Derivatives, Liabilities                
Liabilities, Fair Value Disclosure, Recurring 784.4   784.4     766.2    
Funds Withheld Receivable 1,543.4   1,543.4     1,535.1    
Assets, Fair Value Disclosure, Recurring 1,576.1   1,576.1     1,561.0    
Recurring [Member] | Foreign Exchange Forward [Member]                
Derivatives, Liabilities                
Derivative Liability 2.1   2.1     2.0    
Recurring [Member] | Commodity Option [Member]                
Derivatives, Assets                
Derivatives 4.3   4.3     2.9    
Derivatives, Liabilities                
Derivative Liability 0.1   0.1     0.1    
Recurring [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 13.3   13.3     11.3    
Recurring [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 10.5   10.5     5.9    
Recurring [Member] | FIA embedded derivatives, included in contractholder funds [Member]                
Derivatives, Liabilities                
Derivative Liability 121.0   121.0     131.2    
Recurring [Member] | Interest Rate Swap [Member]                
Derivatives, Liabilities                
Derivative Liability           1.1    
Recurring [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member]                
Derivatives, Assets                
Derivatives 4.6   4.6     5.8    
Recurring [Member] | Level 1 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets 0.0   0.0     0.0    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure 0.0   0.0     0.0    
Liabilities, Fair Value Disclosure, Recurring 0.0   0.0     0.0    
Funds Withheld Receivable 80.5   80.5     69.9    
Assets, Fair Value Disclosure, Recurring 80.5   80.5     69.9    
Recurring [Member] | Level 1 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.0    
Recurring [Member] | Level 1 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.0    
Recurring [Member] | Level 1 [Member] | Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Derivative Liability           0.0    
Recurring [Member] | Level 2 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets 0.0   0.0     0.0    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure 5,867.8   5,867.8     5,700.1    
Liabilities, Fair Value Disclosure, Recurring 2.2   2.2     3.2    
Funds Withheld Receivable 1,413.8   1,413.8     1,387.1    
Assets, Fair Value Disclosure, Recurring 1,446.5   1,446.5     1,413.0    
Recurring [Member] | Level 2 [Member] | Foreign Exchange Forward [Member]                
Derivatives, Liabilities                
Derivative Liability 2.1   2.1     2.0    
Recurring [Member] | Level 2 [Member] | Commodity Option [Member]                
Derivatives, Assets                
Derivatives 4.3   4.3     2.9    
Derivatives, Liabilities                
Derivative Liability 0.1   0.1     0.1    
Recurring [Member] | Level 2 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 13.3   13.3     11.3    
Recurring [Member] | Level 2 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 10.5   10.5     5.9    
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]                
Derivatives, Liabilities                
Derivative Liability           1.1    
Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member]                
Derivatives, Assets                
Derivatives 4.6   4.6     5.8    
Recurring [Member] | Level 3 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets 14.6   14.6     43.5    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure 892.7   892.7     952.0    
Liabilities, Fair Value Disclosure, Recurring 782.2   782.2     763.0    
Funds Withheld Receivable 49.1   49.1     78.1    
Assets, Fair Value Disclosure, Recurring 49.1   49.1     78.1    
Recurring [Member] | Level 3 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.0    
Recurring [Member] | Level 3 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.0    
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member]                
Derivatives, Liabilities                
Derivative Liability 121.0   121.0     131.2    
Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member]                
Derivatives, Assets                
Derivatives           0.0    
Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 661.2 654.0 661.2 654.0 $ 634.5 631.8 $ 629.0 $ 629.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 21.1 23.9 8.5 20.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 5.6 $ 1.1 20.9 $ (4.6)        
Estimate of Fair Value Measurement [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [1] 8.3   8.3     8.5    
Asset-backed loans [1] 6.3   6.3     35.0    
Liabilities                
Total debt [1],[2] 5,877.9   5,877.9     5,729.2    
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 882.6   882.6     922.9    
Estimate of Fair Value Measurement [Member] | Recurring [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets 14.6   14.6     43.5    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure 6,760.5   6,760.5     6,652.1    
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Derivative Liability 661.2   661.2     631.8    
Reported Value Measurement [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [1] 8.3   8.3     8.5    
Asset-backed loans [1] 6.3   6.3     35.0    
Total financial assets 14.6   14.6          
Liabilities                
Total debt [1],[2] 5,623.9   5,623.9          
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 946.0   946.0     988.3    
Financial Liabilities Fair Value Disclosure 6,569.9   6,569.9          
Reported Value Measurement [Member] | Recurring [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets           43.5    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure           6,419.2    
Discounted Cash Flow [Member] | Recurring [Member] | Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Derivative Liability $ 661.2   $ 661.2     $ 631.8    
[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.
[3] (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[4] (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.