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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) - Valuation Technique [Domain] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Document Period End Date     Jun. 30, 2015          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,148.1 $ 930.6 $ 1,148.1 $ 930.6 $ 1,222.9 $ 1,066.0 $ 755.6 $ 523.5
Assets                
Cash and cash equivalents 1,293.2 1,455.9 1,293.2 1,455.9   1,319.2   1,899.7
Derivatives, Assets                
Derivatives 220.4   220.4     296.3    
Fixed maturity securities, available-for-sale:                
Asset-backed loans 490.0   490.0     811.6    
Other invested assets 442.4   442.4     165.0    
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (13.8) 1.5 (4.9) 2.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (24.1) 15.9 4.3 20.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   191.0 186.8 425.3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1.6) (1.0) (1.6) (1.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (53.4) (13.5) (87.1) (15.9)        
Net transfer In (Out) of Level 3 (a) 18.1 [1] (18.9) [2] (15.4) [3] (23.9) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 2,768.3 2,019.4 2,768.3 2,019.4 2,801.9 2,059.4 2,234.5 1,875.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (75.4) 112.9 240.3 340.9        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0   0.0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 77.6 0.0 514.6 150.6        
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 (35.8) (328.0) (46.0) (347.3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0.0 [1] 0.0 [2] 0.0 [3] 0.0 [4]        
Asset-backed Securities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 33.1 5.9 33.1 5.9 34.3 37.0 10.7 5.0
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0.0   0.1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (0.1)   (0.1) (0.3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0   6.7 5.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (0.1)   (0.2)          
Net transfer In (Out) of Level 3 (a) (1.0) [3] (4.8) [2] (10.4) [3] (3.8) [4]        
Commercial Mortgage Backed Securities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 140.1 83.9 140.1 83.9 142.5 83.1   5.7
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1.9) 0.1 0.4 0.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   83.8 57.7 83.8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (0.5)   (1.1)          
Net transfer In (Out) of Level 3 (a) [4]       (6.0)        
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 916.9 745.2 916.9 745.2 941.1 850.0 657.0 461.1
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0.0   2.3          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (20.0) 14.4 3.3 18.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 88.9 122.4 283.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (1.6) (1.0) (1.6) (1.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2.6)   (35.4) (2.4)        
Net transfer In (Out) of Level 3 (a)   (14.1) [2] (24.1) [3] (14.1) [4]        
Municipals [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 37.5 36.5 37.5 36.5 39.8 37.2 35.6  
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0.0   0.0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2.1) 0.9 0.7 1.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0   0.0 35.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0.0   0.0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (0.2)   (0.4)          
Net transfer In (Out) of Level 3 (a) 0.0 [1]   0.0 [3]          
Held for trading [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0.0 0.0 0.0 0.0        
Equity Securities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 6.0 0.0 6.0 0.0 6.0 6.0 10.8 10.7
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   1.2   1.3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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, Asset, Purchases 0.0 1.5 0.0 1.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 (13.5) 0.0 (13.5)        
Net transfer In (Out) of Level 3 (a) 0.0 [1] 0.0 [2] 0.0 [3] 0.0 [4]        
Nomura Fund Linked Note [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 14.5 11.6 14.5 11.6 12.2 11.2 0.0 0.0
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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, Asset, Purchases 0.0 11.3 0.0 11.3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 0.0 0.0 0.0        
Net transfer In (Out) of Level 3 (a) 19.1 [1] 0.0 [1] 19.1 [3] 0.0 [1]        
Embedded Derivative Financial Instruments [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (16.8) 0.3 (15.8) 0.3        
Other Invested Assets [Member]                
Fixed maturity securities, available-for-sale:                
Trading Securities           165.0    
Level 2 [Member]                
Liabilities                
Total debt [5],[6] 6,941.9   6,941.9     5,308.5    
Level 3 [Member]                
Fixed maturity securities, available-for-sale:                
Asset-backed loans [5] 490.0   490.0     151.7    
Liabilities                
Total debt [5],[6] 65.4   65.4          
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [5] 14,016.1   14,016.1     13,108.8    
Level 3 [Member] | Policy loans [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [5] 427.9   427.9     811.6    
Recurring [Member]                
Assets                
Contingent Purchase Price Reduction Receivable Fair Value Disclosure 0.0   0.0     41.5    
Derivatives, Liabilities                
Liabilities, Fair Value Disclosure, Recurring 2,773.1   2,773.1     2,062.2    
Funds Withheld Receivable [7] 641.7   641.7     154.4    
Assets, Fair Value Disclosure, Recurring 19,238.2   19,238.2     18,501.7    
Recurring [Member] | U.S. Government securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 596.3   596.3     296.0    
Recurring [Member] | Foreign exchange forward agreements [Member]                
Derivatives, Assets                
Derivatives           12.8    
Derivatives, Liabilities                
Derivative Liability 1.0   1.0     0.5    
Recurring [Member] | Commodity Option [Member]                
Derivatives, Assets                
Derivatives 10.3   10.3     3.2    
Derivatives, Liabilities                
Derivative Liability 1.6   1.6     0.4    
Recurring [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 220.4   220.4     296.3    
Recurring [Member] | Available For Sale Embedded Derivatives [Member]                
Fixed maturity securities, available-for-sale:                
Equity securities - available-for-sale 579.6   579.6     663.6    
Recurring [Member] | FIA embedded derivatives, included in contractholder funds [Member]                
Derivatives, Liabilities                
Derivative Liability 2,173.7   2,173.7     1,908.1    
Recurring [Member] | Interest Rate Contract [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.6    
Recurring [Member] | Interest Rate Swap [Member]                
Derivatives, Liabilities                
Derivative Liability 2.2   2.2     1.8    
Recurring [Member] | Asset-backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,887.5   1,887.5     1,792.9    
Recurring [Member] | Commercial Mortgage Backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 821.6   821.6     636.9    
Recurring [Member] | Corporate Debt Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 9,551.1   9,551.1     9,795.8    
Recurring [Member] | Hybrids [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,241.1   1,241.1     1,316.1    
Recurring [Member] | Municipals [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,450.6   1,450.6     1,259.8    
Recurring [Member] | Residential Mortgage Backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 2,175.4   2,175.4     2,114.0    
Recurring [Member] | Equity [Member]                
Fixed maturity securities, available-for-sale:                
Trading Securities 41.9   41.9     104.5    
Recurring [Member] | Other Invested Assets [Member]                
Fixed maturity securities, available-for-sale:                
Other invested assets 14.5   14.5     13.3    
Recurring [Member] | Level 1 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets [5] 1,293.2   1,293.2     1,319.2    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure [5] 0.0   0.0     0.0    
Liabilities, Fair Value Disclosure, Recurring 0.0   0.0     0.0    
Funds Withheld Receivable [7] 45.8   45.8     0.0    
Assets, Fair Value Disclosure, Recurring 527.8   527.8     279.3    
Recurring [Member] | Level 1 [Member] | U.S. Government securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 413.4   413.4     115.6    
Recurring [Member] | Level 1 [Member] | Available For Sale Embedded Derivatives [Member]                
Fixed maturity securities, available-for-sale:                
Equity securities - available-for-sale 26.7   26.7     59.2    
Recurring [Member] | Level 1 [Member] | Fixed Maturities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Cash and Cash Equivalents, Fair Value Disclosure [5] 1,293.2   1,293.2     1,319.2    
Recurring [Member] | Level 1 [Member] | Equity [Member]                
Fixed maturity securities, available-for-sale:                
Trading Securities 41.9   41.9     104.5    
Recurring [Member] | Level 1 [Member] | Other Invested Assets [Member]                
Fixed maturity securities, available-for-sale:                
Other invested assets 0.0   0.0     0.0    
Recurring [Member] | Level 2 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets [5] 0.0   0.0     0.0    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure [5] 6,941.9   6,941.9     5,308.5    
Liabilities, Fair Value Disclosure, Recurring 4.8   4.8     2.8    
Funds Withheld Receivable [7] 595.9   595.9     154.4    
Assets, Fair Value Disclosure, Recurring 17,562.3   17,562.3     17,156.4    
Recurring [Member] | Level 2 [Member] | U.S. Government securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 182.9   182.9     180.4    
Recurring [Member] | Level 2 [Member] | Foreign exchange forward agreements [Member]                
Derivatives, Assets                
Derivatives           12.8    
Derivatives, Liabilities                
Derivative Liability 1.0   1.0     0.5    
Recurring [Member] | Level 2 [Member] | Commodity Option [Member]                
Derivatives, Assets                
Derivatives 10.3   10.3     3.2    
Derivatives, Liabilities                
Derivative Liability 1.6   1.6     0.4    
Recurring [Member] | Level 2 [Member] | Call options [Member]                
Derivatives, Assets                
Derivatives 220.4   220.4     296.3    
Recurring [Member] | Level 2 [Member] | Available For Sale Embedded Derivatives [Member]                
Fixed maturity securities, available-for-sale:                
Equity securities - available-for-sale 546.9   546.9     598.4    
Recurring [Member] | Level 2 [Member] | Future Contracts [Member]                
Derivatives, Liabilities                
Derivative Liability           0.1    
Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member]                
Derivatives, Assets                
Derivatives 0.0   0.0     0.6    
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]                
Derivatives, Liabilities                
Derivative Liability 2.2   2.2     1.8    
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,854.4   1,854.4     1,755.9    
Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 681.5   681.5     553.8    
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 8,634.2   8,634.2     8,945.8    
Recurring [Member] | Level 2 [Member] | Hybrids [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,241.1   1,241.1     1,316.1    
Recurring [Member] | Level 2 [Member] | Municipals [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 1,413.1   1,413.1     1,222.6    
Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 2,175.4   2,175.4     2,114.0    
Recurring [Member] | Level 2 [Member] | Fixed Maturities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Cash and Cash Equivalents, Fair Value Disclosure [5] 0.0   0.0     0.0    
Recurring [Member] | Level 2 [Member] | Other Invested Assets [Member]                
Fixed maturity securities, available-for-sale:                
Other invested assets           2.1    
Recurring [Member] | Level 3 [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets [5] 917.9   917.9     963.3    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure [5] 14,081.5   14,081.5     13,108.8    
Liabilities, Fair Value Disclosure, Recurring 2,768.3   2,768.3     2,059.4    
Funds Withheld Receivable [7] 0.0   0.0     0.0    
Assets, Fair Value Disclosure, Recurring 1,148.1   1,148.1     1,066.0    
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member]                
Derivatives, Liabilities                
Derivative Liability 2,173.7   2,173.7     1,908.1    
Recurring [Member] | Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Derivative Liability 594.6   594.6     151.3    
Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 33.1   33.1          
Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 140.1   140.1          
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 916.9   916.9     850.0    
Recurring [Member] | Level 3 [Member] | Hybrids [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities 0.0   0.0     0.0    
Recurring [Member] | Level 3 [Member] | Municipals [Member]                
Fixed maturity securities, available-for-sale:                
Available-for-sale Securities           37.2    
Recurring [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Cash and Cash Equivalents, Fair Value Disclosure [5] 0.0   0.0     0.0    
Recurring [Member] | Level 3 [Member] | Other Invested Assets [Member] | Other Invested Assets [Member]                
Fixed maturity securities, available-for-sale:                
Other invested assets 14.5   14.5     11.2    
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 Value   41.5   41.5 47.0 41.5 41.5 41.0
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 3.0   8.5 0.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (50.0)   (50.0)          
Contingent Purchase Price Reduction Receivable [Member] | Recurring [Member] | Level 3 [Member]                
Assets                
Contingent Purchase Price Reduction Receivable Fair Value Disclosure 0.0   0.0     41.5    
FIA embedded derivatives, included in contractholder funds [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 2,173.7 1,864.5 2,173.7 1,864.5 2,217.4 1,908.1 1,718.7 1,544.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (43.7) 145.8 265.6 320.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net   0.0 [2]   0.0 [4]        
Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 594.6 154.9 594.6 154.9 $ 584.5 151.3 151.0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (31.7) 5.1 (25.3) 8.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 77.6   514.6 150.6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (35.8) (1.2) (46.0) (3.8)        
Equity conversion feature of preferred stock [Member]                
Derivatives, Liabilities                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   0.0   0.0     $ 364.8 $ 330.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   (38.0)   12.7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales   0.0   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   (326.8)   (343.5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net   $ 0.0 [2]   $ 0.0 [4]        
Estimate of Fair Value Measurement [Member]                
Fixed maturity securities, available-for-sale:                
Asset-backed loans [5] 490.0   490.0     151.7    
Liabilities                
Total debt [5],[6] 7,007.3   7,007.3     5,308.5    
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [5] 14,016.1   14,016.1     13,108.8    
Estimate of Fair Value Measurement [Member] | Policy loans [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [5] 427.9   427.9     811.6    
Estimate of Fair Value Measurement [Member] | Recurring [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets [5] 2,211.1   2,211.1     2,282.5    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure [5] 21,023.4   21,023.4     18,417.3    
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Future Contracts [Member]                
Derivatives, Liabilities                
Derivative Liability           0.1    
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member]                
Derivatives, Liabilities                
Derivative Liability 594.6   594.6     151.3    
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Cash and Cash Equivalents, Fair Value Disclosure [5] 1,293.2   1,293.2     1,319.2    
Reported Value Measurement [Member]                
Fixed maturity securities, available-for-sale:                
Asset-backed loans [5] 490.0   490.0     151.7    
Total financial assets [5] 2,211.1   2,211.1          
Liabilities                
Total debt [5],[6] 6,832.7   6,832.7     5,157.8    
Derivatives, Liabilities                
Liabilities Related to Investment Contracts, Fair Value Disclosure [5] 15,530.1   15,530.1     14,555.4    
Financial Liabilities Fair Value Disclosure [5] 22,362.8   22,362.8          
Reported Value Measurement [Member] | Policy loans [Member]                
Fixed maturity securities, available-for-sale:                
Policy loans and other invested assets [5] 427.9   427.9     811.6    
Reported Value Measurement [Member] | Recurring [Member]                
Fixed maturity securities, available-for-sale:                
Total financial assets [5]           2,282.5    
Derivatives, Liabilities                
Financial Liabilities Fair Value Disclosure [5]           19,713.2    
Reported Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member]                
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]                
Cash and Cash Equivalents, Fair Value Disclosure [5] $ 1,293.2   $ 1,293.2     $ 1,319.2    
[1] (a) During the three months ended June 30, 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.
[2] (a) The net transfers out of Level 3 for the three months ended June 30, 2014 were exclusively to Level 2.
[3] (a) During the nine months ended June 30, 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.
[4] (a) The net transfers out of Level 3 for the nine months ended June 30, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from Level 3 to Level 2.
[5] (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.
[6] (b)The fair values of debt set forth above are generally based on quoted or observed market prices.
[7] (a) included in other assets in the accompanying unaudited condensed Consolidated Balance Sheets.