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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments 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
Sep. 30, 2013
Sep. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value     $ 2,778.6 $ 2,059.4 $ 1,875.2 $ 1,782.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   $ 95.2 266.0 383.4    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)     0.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0.0 445.4 150.6    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales   0.0 0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   2.8 (7.8) 349.8    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net   0.0 [1] 0.0 [2] 0.0 [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (0.1) (6.8) 1.7    
Other invested assets     39.6 28.8    
Assets, Fair Value Disclosure     1,233.1 1,066.0    
Liabilities            
Liabilities, Fair Value Disclosure     2,778.6 2,059.4    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (14.0) 9.9 22.2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   428.2 323.2 570.5    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   20.3 1.6 12.1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   23.3 142.2 15.9    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ (34.5) (53.0) [1] (15.4) [2] (23.9) [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     1,233.1 1,066.0 523.5 206.0
Funds withheld for reinsurance liability [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     0.0      
Liabilities            
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     19.2      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales     0.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements     0.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [2]     0.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     19.2 0.0    
Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0.0 0.1      
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (0.2) (0.1) (0.3)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0.0 14.2 36.1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0.2 30.7      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   (10.5) [1] (10.4) [2] (3.8) [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     10.1 37.0 5.0 15.9
Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0.0        
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (0.3) (1.8)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   1.0 63.9 83.7    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0.0   0.3    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0.0 1.6      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0.0 [1]   (6.0) [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     143.6 83.1 5.7 5.0
Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (0.3) 1.9      
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (13.4) 10.1 19.1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   406.0 201.4 398.1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   9.6 1.6 11.8    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   23.1 59.5 2.4    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   (33.8) [1] (24.1) [2] (14.1) [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     978.2 850.0 461.1 135.3
Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0.2 0.0 0.0    
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)     0.0 1.2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   10.5 24.5 4.8    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   10.7 0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0.0 0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     0.0 [2] 0.0 [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     30.5 6.0 0.0  
Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     (17.3) (0.1)    
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)     0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases     0.0 11.3    
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     0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     19.1 [2] 0.0 [3]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     13.0 11.2 0.0  
Hybrids            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0.0        
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (0.1)        
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   0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [1]   (8.7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value         0.0 8.8
Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Contingent Purchase Price Reduction Receivable Fair Value Disclosure     0.0 41.5    
Funds Withheld Receivable [4]     652.3 154.4    
Fair Value, Measurements, Recurring | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     1,860.5 1,792.9    
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     882.2 636.9    
Fair Value, Measurements, Recurring | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     9,544.7 9,795.8    
Fair Value, Measurements, Recurring | Hybrids            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     1,213.3 1,316.1    
Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0.0 8.5 0.5    
Liabilities            
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   0.0 50.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [1]   $ 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value       41.5 $ 41.0 $ 41.0
Available-for-sale embedded derivatives | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Equity securities - available-for-sale     616.6 663.6    
FIA embedded derivatives, included in contractholder funds | Fair Value, Measurements, Recurring            
Liabilities            
Derivative Liability     $ 2,149.4 $ 1,908.1    
Minimum [Member] | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     100.00% 100.00%    
Minimum [Member] | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     99.00% 105.00%    
Minimum [Member] | Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Probability of collection     0.00% 88.00%    
Minimum [Member] | Funds withheld for reinsurance liability [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value Inputs, Discount Rate     6.00%      
Minimum [Member] | FIA embedded derivatives, included in contractholder funds            
Liabilities            
Market value of option     0.00% 0.00%    
Maximum | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     108.00% 109.00%    
Maximum | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     119.00% 121.00%    
Maximum | Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Probability of collection     0.00% 96.00%    
Fair Value Inputs, Discount Rate     0.00% 1.00%    
Credit insurance risk premium     0.00% 12.00%    
Maximum | Funds withheld for reinsurance liability [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value Inputs, Discount Rate     12.00%      
Maximum | FIA embedded derivatives, included in contractholder funds            
Liabilities            
Market value of option     34.00% 50.00%    
SWAP rates     2.00% 3.00%    
Weighted average | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     103.00% 101.00%    
Weighted average | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     111.00% 118.00%    
Weighted average | Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value Inputs Quoted Prices     100.00% 100.00%    
Offered quotes     100.00% 0.00%    
Weighted average | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value Inputs Black Scholes Model     100.00% 0.00%    
Probability of collection     50.00% 0.00%    
Fair Value Inputs, Discount Rate     10.00% 0.00%    
Weighted average | Municipal Debt Securities [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     111.00% 107.00%    
Weighted average | Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Probability of collection     0.00% 92.00%    
Weighted average | Funds withheld for reinsurance liability [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value Inputs, Discount Rate     8.00% 0.00%    
Weighted average | FIA embedded derivatives, included in contractholder funds            
Liabilities            
Market value of option     1.00% 3.00%    
SWAP rates     2.00% 2.00%    
Mortality multiplier     80.00% 80.00%    
Non-performance spread     0.25% 0.25%    
Market Approach Valuation Technique [Member] | Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Net Asset Value      
Assets, Fair Value Disclosure     $ 25.0 $ 0.0    
Broker Quoted [Member] | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Broker-quoted      
Broker Quoted [Member] | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Broker-quoted      
Broker Quoted [Member] | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Broker-quoted      
Assets, Fair Value Disclosure     $ 911.7 $ 848.0    
Broker Quoted [Member] | Municipal            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Broker-quoted      
Broker Quoted [Member] | Minimum [Member] | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     57.00% 62.00%    
Broker Quoted [Member] | Maximum | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     114.00% 120.00%    
Broker Quoted [Member] | Weighted average | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Offered quotes     101.00% 100.00%    
Discounted Cash Flow [Member] | Funds withheld for reinsurance liability [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Discounted Cash Flow      
Discounted Cash Flow [Member] | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Discounted Cash Flow      
Discounted Cash Flow [Member] | Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Discounted cash flow      
Discounted Cash Flow [Member] | FIA embedded derivatives, included in contractholder funds            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Discounted cash flow      
Discounted Cash Flow [Member] | Minimum [Member] | FIA embedded derivatives, included in contractholder funds            
Liabilities            
SWAP rates     1.00% 2.00%    
Surrender rates     0.50% 0.50%    
Discounted Cash Flow [Member] | Maximum | Contingent Purchase Price Reduction Receivable [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Expected term     0 years 4 months 5 days    
Discounted Cash Flow [Member] | Maximum | FIA embedded derivatives, included in contractholder funds            
Liabilities            
Surrender rates     75.00% 75.00%    
Discounted Cash Flow [Member] | Weighted average | FIA embedded derivatives, included in contractholder funds            
Liabilities            
Surrender rates     10.00% 7.00%    
Matrix Pricing [Member] | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Matrix Pricing      
Assets, Fair Value Disclosure     $ 66.5 $ 2.0    
Matrix Pricing [Member] | Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Matrix Pricing      
Matrix Pricing [Member] | Minimum [Member] | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Quoted prices     105.00% 0.00%    
Matrix Pricing [Member] | Maximum | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Quoted prices     142.00% 0.00%    
Matrix Pricing [Member] | Weighted average | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Quoted prices     110.00% 142.00%    
Black Scholes Model [Member] | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Black scholes model      
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Funds Withheld Receivable [4]     $ 19.2 $ 0.0    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     10.1 37.0    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     143.6 83.1    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Corporates            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     978.2 850.0    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Hybrids            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Contingent Purchase Price Reduction Receivable Fair Value Disclosure       41.5    
Fair Value, Inputs, Level 3 [Member] | Market Pricing [Member] | Fair Value, Measurements, Recurring | Municipal Bonds [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities       37.2    
Fair Value, Inputs, Level 3 [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring | Asset-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     10.1      
Fair Value, Inputs, Level 3 [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     143.6      
Fair Value, Inputs, Level 3 [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring | Municipal Bonds [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Available-for-sale Securities     38.5      
Fair Value, Inputs, Level 3 [Member] | Broker Quoted [Member] | Available-for-sale embedded derivatives | Fair Value, Measurements, Recurring | Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Equity securities - available-for-sale     6.0 6.0    
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow [Member] | Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Contingent Purchase Price Reduction Receivable Fair Value Disclosure     0.0      
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow [Member] | FIA embedded derivatives, included in contractholder funds | Fair Value, Measurements, Recurring            
Liabilities            
Derivative Liability     $ 2,149.4 1,908.1    
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow [Member] | Front Street Future Policyholder Benefits Reserve [Member] | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Valuation Technique     Discounted cash flow      
Liabilities            
Derivative Liability     $ 629.2 151.3    
Fair Value, Inputs, Level 3 [Member] | Matrix Pricing [Member] | Available-for-sale embedded derivatives | Fair Value, Measurements, Recurring | Equity Securities            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Equity securities - available-for-sale     30.5      
Other invested assets | Fair Value, Measurements, Recurring            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Other invested assets     13.0 13.3    
Other invested assets | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Other invested assets     13.0      
Other invested assets | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value, Measurements, Recurring | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Other invested assets     2.8 0.0    
Other invested assets | Fair Value, Inputs, Level 3 [Member] | Option Pricing [Member] | Fair Value, Measurements, Recurring | Other invested assets            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Other invested assets     10.2 11.2    
Front Street Future Policyholder Benefits Reserve [Member]            
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value     629.2 151.3    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings     24.7 7.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases     445.4 150.6    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements     $ (7.8) $ 6.3    
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member]            
Liabilities            
Non-performance spread     0.16% 0.50%    
Risk margin for uncertainty     1.00%      
Front Street Future Policyholder Benefits Reserve [Member] | Maximum            
Liabilities            
Non-performance spread     0.46% 1.50%    
Risk margin for uncertainty     1.00%      
Front Street Future Policyholder Benefits Reserve [Member] | Weighted average            
Liabilities            
Risk margin for uncertainty     0.00% 0.50%    
[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) included in “Other assets” in the Consolidated Balance Sheets.