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Summary of Changes in Fair Value Associated With Level 3 Assets (Detail) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value $ 149.9 $ 143.7 $ 170.5 $ 170.8
Calls/ Maturities/ Paydowns (5.4) (5.6) (10.8) (9.3)
Purchases 0 16.3 0 34.3
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation (0.3) 4.8 (0.1) 4.4
Net Transfers in (out) 0 0 (15.4) [1] (41.0) [2]
Ending Fair value 144.2 159.2 144.2 159.2
Corporate Debt Securities | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 29.6 28.9 29.5 28.2
Calls/ Maturities/ Paydowns 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation 0.2 0.1 0.3 0.8
Net Transfers in (out) 0 0 0 [1] 0 [2]
Ending Fair value 29.8 29.0 29.8 29.0
Residential Mortgage Backed Securities | Asset-backed Securities | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 76.3 73.5 96.7 46.1
Calls/ Maturities/ Paydowns (4.8) (4.5) (9.8) (7.5)
Purchases 0 16.3 0 34.3
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation 0 3.2 0 3.5
Net Transfers in (out) 0 0 (15.4) [1] 12.1 [2]
Ending Fair value 71.5 88.5 71.5 88.5
Commercial Mortgage Backed Securities | Asset-backed Securities | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 27.1 21.0 27.5 21.6
Calls/ Maturities/ Paydowns (0.1) 0 (0.1) 0
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation (0.5) 1.6 (0.9) 1.0
Net Transfers in (out) 0 0 0 [1] 0 [2]
Ending Fair value 26.5 22.6 26.5 22.6
Other Asset Backed Securities | Asset-backed Securities | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 5.1 6.2 5.0 7.8
Calls/ Maturities/ Paydowns (0.5) (0.5) (0.9) (1.2)
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation (0.1) 0.7 0.4 (0.2)
Net Transfers in (out) 0 0 0 [1] 0 [2]
Ending Fair value 4.5 6.4 4.5 6.4
Redeemable Preferred Stock | Industrial, Miscellaneous, and All Others | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 0 0 0 53.1
Calls/ Maturities/ Paydowns 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation 0 0 0 0
Net Transfers in (out) 0 0 0 [1] (53.1) [2]
Ending Fair value 0 0 0 0
Asset-backed Securities | Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 108.5 100.7 129.2 75.5
Calls/ Maturities/ Paydowns (5.4) (5.0) (10.8) (8.7)
Purchases 0 16.3 0 34.3
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation (0.6) 5.5 (0.5) 4.3
Net Transfers in (out) 0 0 (15.4) [1] 12.1 [2]
Ending Fair value 102.5 117.5 102.5 117.5
Fixed Maturities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 138.1 130.7 158.7 157.9
Calls/ Maturities/ Paydowns (5.4) (5.0) (10.8) (8.7)
Purchases 0 16.3 0 34.3
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation (0.4) 4.5 (0.2) 4.0
Net Transfers in (out) 0 0 (15.4) [1] (41.0) [2]
Ending Fair value 132.3 146.5 132.3 146.5
Fixed Maturities | Other Debt Securities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 0 1.1 0 1.1
Calls/ Maturities/ Paydowns 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation 0 (1.1) 0 (1.1)
Net Transfers in (out) 0 0 0 [1] 0 [2]
Ending Fair value 0 0 0 0
Common Equities | Other Equity Like Investments | Equity Securities
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Fair Value 11.8 13.0 11.8 12.9
Calls/ Maturities/ Paydowns 0 (0.6) 0 (0.6)
Purchases 0 0 0 0
Sales 0 0 0 0
Net Realized (Gain)/loss 0 0 0 0
Change in Valuation 0.1 0.3 0.1 0.4
Net Transfers in (out) 0 0 0 [1] 0 [2]
Ending Fair value $ 11.9 $ 12.7 $ 11.9 $ 12.7
[1] The $(15.4) million was transferred out of Level 3 into Level 2 due to the availability of vendor pricing on a residential mortgage-backed security.
[2] The $12.1 million was transferred from Level 2 into Level 3 due to a lack of trade volume and the $(53.1) million was transferred out of Level 3 into Level 2 due to the availability of vendor pricing on a redeemable preferred stock.