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Fair Value Measurements - Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments $ 21,342.0 $ 20,700.6
Derivative assets 421.3 464.4
Derivatives liabilities 143.4 216.6
Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Limited partnerships/corporations 250.8 180.9
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 617.7 529.7
Derivative assets 421.3 464.4
Notes receivable from affiliates 175.0 175.0
Assets held in separate accounts 62,808.4 60,104.9
Derivatives liabilities 143.4 216.6
Long-term debt, fair value 4.9 4.9
Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Limited partnerships/corporations 250.8 180.9
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement 617.7 529.7
Derivative assets 421.3 464.4
Notes receivable from affiliates 206.0 186.4
Assets held in separate accounts 62,808.4 60,104.9
Derivatives liabilities 143.4 216.6
Long-term debt, fair value 4.9 4.9
Funding agreements without fixed maturities and deferred annuities(1) | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 21,124.5 [1] 21,010.8 [1]
Funding agreements without fixed maturities and deferred annuities(1) | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 25,594.7 [1] 24,379.6 [1]
Supplementary contracts, immediate annuities and other | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 595.2 624.3
Supplementary contracts, immediate annuities and other | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 701.3 727.1
FIA | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 26.3 23.1
FIA | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 26.3 23.1
Stabilizer and MCGs | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 45.0 0
Stabilizer and MCGs | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities 45.0 0
Mortgage loans on real estate | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 3,564.7 3,396.1
Mortgage loans on real estate | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 3,667.6 3,403.9
Policy loans | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 240.2 242.0
Policy loans | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 240.2 242.0
Fixed maturities, available-for-sale, including securities pledged | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 21,367.7 20,705.8
Fixed maturities, available-for-sale, including securities pledged | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 21,367.7 20,705.8
Equity securities, available-for-sale | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 122.3 134.9
Equity securities, available-for-sale | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments 122.3 134.9
Reinsurance Agreements | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivatives liabilities (24.4) (54.0)
Reinsurance Agreements | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivatives liabilities $ (24.4) $ (54.0)
[1] Certain amounts included in Funding agreements without fixed maturities and deferred annuities are also reflected within the Annuity product guarantees section of the table above.