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Financial Instruments Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments $ 19,662.8 $ 18,791.4
Derivatives 532.3 446.6
Derivative Liabilities 363.0 360.1
Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Limited partnerships/corporations 380.7 510.6
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 1,192.2 958.7
Derivatives 532.3 446.6
Notes receivable from affiliates 175.0 175.0
Assets held in separate accounts 49,305.7 45,295.2
Derivative Liabilities 363.0 360.0
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Limited partnerships/corporations 380.7 510.6
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement 1,192.2 958.7
Derivatives 532.3 446.6
Notes receivable from affiliates 172.6 165.2
Assets held in separate accounts 49,305.7 45,295.2
Derivative Liabilities 363.0 360.0
Investment Contract, with a Fixed Maturity | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 1,117.6 1,222.4
Investment Contract, with a Fixed Maturity | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 1,297.4 1,369.1
Without a fixed maturity | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 18,907.0 18,410.4
Without a fixed maturity | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 24,420.6 21,739.8
Product guarantees | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 133.0 221.0
Product guarantees | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 133.0 221.0
Fixed indexed annuities (FIA) | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 17.6 16.3
Fixed indexed annuities (FIA) | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liabilities Related to Investment Contracts, Fair Value Disclosure 17.6 16.3
Mortgage loans on real estate | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 2,709.8 2,373.5
Mortgage loans on real estate | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 2,796.3 2,423.1
Loans-Dutch State obligation | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 379.1 417.0
Loans-Dutch State obligation | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 382.6 421.9
Policy loans | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 240.5 245.9
Policy loans | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of loans 240.5 245.9
Fixed maturities, available-for-sale, including securities pledged | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments 19,283.9 18,728.3
Fixed maturities, available-for-sale, including securities pledged | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments 19,283.9 18,728.3
Fixed maturities, at fair value using the fair value option | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments 587.8 511.9
Fixed maturities, at fair value using the fair value option | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments 587.8 511.9
Equity securities, available-for-sale | Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments 144.7 144.9
Equity securities, available-for-sale | Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of investments $ 144.7 $ 144.9