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Investment Securities (Fair value measurements) (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Level 1
Dec. 31, 2013
Level 1
Mar. 31, 2014
Level 2
Dec. 31, 2013
Level 2
Mar. 31, 2014
Level 3
Dec. 31, 2013
Level 3
Mar. 31, 2013
Level 3
Dec. 31, 2012
Level 3
Mar. 31, 2014
Hedge funds
fund
Dec. 31, 2013
Hedge funds
fund
Mar. 31, 2014
Private equity funds
fund
Dec. 31, 2013
Private equity funds
fund
Mar. 31, 2014
Community Reinvestment Vehicle [Member]
Dec. 31, 2013
Community Reinvestment Vehicle [Member]
Mar. 31, 2014
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Dec. 31, 2013
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Mar. 31, 2014
Single Fund
Dec. 31, 2013
Single Fund
Mar. 31, 2014
Tax Development Fund [Member]
Dec. 31, 2013
Tax Development Fund [Member]
Mar. 31, 2013
Tax Development Fund [Member]
Mar. 31, 2014
Debt securities issued by corporations
Dec. 31, 2013
Debt securities issued by corporations
Mar. 31, 2014
Mortgage-backed and asset-backed securities
Fair Value
Dec. 31, 2013
Mortgage-backed and asset-backed securities
Fair Value
Mar. 31, 2014
Mortgage-backed and asset-backed securities
Level 2
Dec. 31, 2013
Mortgage-backed and asset-backed securities
Level 2
Mar. 31, 2014
Mortgage-backed and asset-backed securities
Level 3
Dec. 31, 2013
Mortgage-backed and asset-backed securities
Level 3
Mar. 31, 2014
Commercial
Fair Value
Dec. 31, 2013
Commercial
Fair Value
Mar. 31, 2014
Commercial
Level 2
Dec. 31, 2013
Commercial
Level 2
Mar. 31, 2014
Commercial
Level 3
Dec. 31, 2013
Commercial
Level 3
Mar. 31, 2014
Preferred stocks
fund
Dec. 31, 2013
Preferred stocks
fund
Mar. 31, 2014
Fixed maturity investments
Level 1
Dec. 31, 2013
Fixed maturity investments
Level 1
Mar. 31, 2014
Fixed maturity investments
Level 2
Dec. 31, 2013
Fixed maturity investments
Level 2
Mar. 31, 2014
Fixed maturity investments
Level 3
Dec. 31, 2013
Fixed maturity investments
Level 3
Mar. 31, 2013
Fixed maturity investments
Level 3
Dec. 31, 2012
Fixed maturity investments
Level 3
Mar. 31, 2014
Convertible fixed maturity investments
Level 1
Dec. 31, 2013
Convertible fixed maturity investments
Level 1
Mar. 31, 2014
Convertible fixed maturity investments
Level 2
Dec. 31, 2013
Convertible fixed maturity investments
Level 2
Mar. 31, 2014
Convertible fixed maturity investments
Level 3
Dec. 31, 2013
Convertible fixed maturity investments
Level 3
Mar. 31, 2013
Convertible fixed maturity investments
Level 3
Dec. 31, 2012
Convertible fixed maturity investments
Level 3
Mar. 31, 2014
Other investments
Dec. 31, 2013
Other investments
Mar. 31, 2014
Other investments
Level 1
Dec. 31, 2013
Other investments
Level 1
Mar. 31, 2014
Other investments
Level 2
Dec. 31, 2013
Other investments
Level 2
Mar. 31, 2014
Other investments
Level 3
Dec. 31, 2013
Other investments
Level 3
Mar. 31, 2013
Other investments
Level 3
Dec. 31, 2012
Other investments
Level 3
Mar. 31, 2014
Recurring basis
Fair Value
Dec. 31, 2013
Recurring basis
Fair Value
Mar. 31, 2014
Recurring basis
Level 1
Dec. 31, 2013
Recurring basis
Level 1
Mar. 31, 2014
Recurring basis
Level 2
Dec. 31, 2013
Recurring basis
Level 2
Mar. 31, 2014
Recurring basis
Level 3
Dec. 31, 2013
Recurring basis
Level 3
Mar. 31, 2014
Recurring basis
U.S. Government and agency obligations
Fair Value
Dec. 31, 2013
Recurring basis
U.S. Government and agency obligations
Fair Value
Mar. 31, 2014
Recurring basis
U.S. Government and agency obligations
Level 1
Dec. 31, 2013
Recurring basis
U.S. Government and agency obligations
Level 1
Mar. 31, 2014
Recurring basis
U.S. Government and agency obligations
Level 2
Dec. 31, 2013
Recurring basis
U.S. Government and agency obligations
Level 2
Mar. 31, 2014
Recurring basis
U.S. Government and agency obligations
Level 3
Dec. 31, 2013
Recurring basis
U.S. Government and agency obligations
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Consumer
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Consumer
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Consumer
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Consumer
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Consumer
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Consumer
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Consumer
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Consumer
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Industrial
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Industrial
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Industrial
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Industrial
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Industrial
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Industrial
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Industrial
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Industrial
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Financial
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Financial
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Financial
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Financial
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Financial
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Financial
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Financial
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Financial
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Communications
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Communications
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Communications
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Communications
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Communications
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Communications
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Communications
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Communications
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Energy
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Energy
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Energy
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Energy
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Energy
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Energy
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Energy
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Energy
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Basic materials
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Basic materials
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Basic materials
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Basic materials
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Basic materials
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Basic materials
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Basic materials
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Basic materials
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Utilities
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Utilities
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Utilities
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Utilities
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Utilities
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Utilities
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Utilities
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Utilities
Level 3
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Technology
Fair Value
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Technology
Fair Value
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Technology
Level 1
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Technology
Level 1
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Technology
Level 2
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Technology
Level 2
Mar. 31, 2014
Recurring basis
Debt securities issued by corporations
Technology
Level 3
Dec. 31, 2013
Recurring basis
Debt securities issued by corporations
Technology
Level 3
Mar. 31, 2014
Recurring basis
Municipal obligations
Fair Value
Dec. 31, 2013
Recurring basis
Municipal obligations
Fair Value
Mar. 31, 2014
Recurring basis
Municipal obligations
Level 1
Dec. 31, 2013
Recurring basis
Municipal obligations
Level 1
Mar. 31, 2014
Recurring basis
Municipal obligations
Level 2
Dec. 31, 2013
Recurring basis
Municipal obligations
Level 2
Mar. 31, 2014
Recurring basis
Municipal obligations
Level 3
Dec. 31, 2013
Recurring basis
Municipal obligations
Level 3
Mar. 31, 2014
Recurring basis
Mortgage-backed and asset-backed securities
Fair Value
Dec. 31, 2013
Recurring basis
Mortgage-backed and asset-backed securities
Fair Value
Mar. 31, 2014
Recurring basis
Mortgage-backed and asset-backed securities
Level 1
Dec. 31, 2013
Recurring basis
Mortgage-backed and asset-backed securities
Level 1
Mar. 31, 2014
Recurring basis
Mortgage-backed and asset-backed securities
Level 2
Dec. 31, 2013
Recurring basis
Mortgage-backed and asset-backed securities
Level 2
Mar. 31, 2014
Recurring basis
Mortgage-backed and asset-backed securities
Level 3
Dec. 31, 2013
Recurring basis
Mortgage-backed and asset-backed securities
Level 3
Mar. 31, 2014
Recurring basis
Foreign government obligations
Fair Value
Dec. 31, 2013
Recurring basis
Foreign government obligations
Fair Value
Mar. 31, 2014
Recurring basis
Foreign government obligations
Level 1
Dec. 31, 2013
Recurring basis
Foreign government obligations
Level 1
Mar. 31, 2014
Recurring basis
Foreign government obligations
Level 2
Dec. 31, 2013
Recurring basis
Foreign government obligations
Level 2
Mar. 31, 2014
Recurring basis
Foreign government obligations
Level 3
Dec. 31, 2013
Recurring basis
Foreign government obligations
Level 3
Mar. 31, 2014
Recurring basis
Preferred stocks
Fair Value
Dec. 31, 2013
Recurring basis
Preferred stocks
Fair Value
Mar. 31, 2014
Recurring basis
Preferred stocks
Level 1
Dec. 31, 2013
Recurring basis
Preferred stocks
Level 1
Mar. 31, 2014
Recurring basis
Preferred stocks
Level 2
Dec. 31, 2013
Recurring basis
Preferred stocks
Level 2
Mar. 31, 2014
Recurring basis
Preferred stocks
Level 3
Dec. 31, 2013
Recurring basis
Preferred stocks
Level 3
Mar. 31, 2014
Recurring basis
Fixed maturity investments
Fair Value
Dec. 31, 2013
Recurring basis
Fixed maturity investments
Fair Value
Mar. 31, 2014
Recurring basis
Fixed maturity investments
Level 1
Dec. 31, 2013
Recurring basis
Fixed maturity investments
Level 1
Mar. 31, 2014
Recurring basis
Fixed maturity investments
Level 2
Dec. 31, 2013
Recurring basis
Fixed maturity investments
Level 2
Mar. 31, 2014
Recurring basis
Fixed maturity investments
Level 3
Dec. 31, 2013
Recurring basis
Fixed maturity investments
Level 3
Mar. 31, 2014
Recurring basis
Short-term investments
Fair Value
Dec. 31, 2013
Recurring basis
Short-term investments
Fair Value
Mar. 31, 2014
Recurring basis
Short-term investments
Level 1
Dec. 31, 2013
Recurring basis
Short-term investments
Level 1
Mar. 31, 2014
Recurring basis
Short-term investments
Level 2
Dec. 31, 2013
Recurring basis
Short-term investments
Level 2
Mar. 31, 2014
Recurring basis
Short-term investments
Level 3
Dec. 31, 2013
Recurring basis
Short-term investments
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Consumer
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Consumer
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Consumer
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Consumer
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Consumer
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Consumer
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Consumer
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Consumer
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Financial
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Financial
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Financial
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Financial
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Financial
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Financial
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Financial
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Financial
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Energy
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Energy
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Energy
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Energy
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Energy
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Energy
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Energy
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Energy
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Basic materials
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Basic materials
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Basic materials
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Basic materials
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Basic materials
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Basic materials
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Basic materials
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Basic materials
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Utilities
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Utilities
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Utilities
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Utilities
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Utilities
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Utilities
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Utilities
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Utilities
Level 3
Mar. 31, 2014
Recurring basis
Common equity securities
Other
Fair Value
Dec. 31, 2013
Recurring basis
Common equity securities
Other
Fair Value
Mar. 31, 2014
Recurring basis
Common equity securities
Other
Level 1
Dec. 31, 2013
Recurring basis
Common equity securities
Other
Level 1
Mar. 31, 2014
Recurring basis
Common equity securities
Other
Level 2
Dec. 31, 2013
Recurring basis
Common equity securities
Other
Level 2
Mar. 31, 2014
Recurring basis
Common equity securities
Other
Level 3
Dec. 31, 2013
Recurring basis
Common equity securities
Other
Level 3
Mar. 31, 2014
Recurring basis
Convertible fixed maturity investments
Fair Value
Dec. 31, 2013
Recurring basis
Convertible fixed maturity investments
Fair Value
Mar. 31, 2014
Recurring basis
Convertible fixed maturity investments
Level 1
Dec. 31, 2013
Recurring basis
Convertible fixed maturity investments
Level 1
Mar. 31, 2014
Recurring basis
Convertible fixed maturity investments
Level 2
Dec. 31, 2013
Recurring basis
Convertible fixed maturity investments
Level 2
Mar. 31, 2014
Recurring basis
Convertible fixed maturity investments
Level 3
Dec. 31, 2013
Recurring basis
Convertible fixed maturity investments
Level 3
Mar. 31, 2014
Recurring basis
Other investments
Fair Value
Dec. 31, 2013
Recurring basis
Other investments
Fair Value
Mar. 31, 2014
Recurring basis
Other investments
Level 1
Dec. 31, 2013
Recurring basis
Other investments
Level 1
Mar. 31, 2014
Recurring basis
Other investments
Level 2
Dec. 31, 2013
Recurring basis
Other investments
Level 2
Mar. 31, 2014
Recurring basis
Other investments
Level 3
Dec. 31, 2013
Recurring basis
Other investments
Level 3
Mar. 31, 2014
Segment, Discontinued Operations
Dec. 31, 2013
Segment, Discontinued Operations
Schedule of Trading Securities and Other Trading Assets [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Change in Deferred Gains (Losses) $ 0 $ (100,000)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Total investment securities 2,415,700,000   2,364,900,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Unrestricted Collateral From Customers 64,300,000   63,300,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Debt securities issued by corporations       558,700,000 [1] 469,500,000 [1] 1,693,700,000 1,753,100,000 213,500,000 [2] 201,900,000 [2] 201,800,000 [2] 198,900,000 [2]                           755,700,000 [3] 754,500,000 [3] 881,300,000 949,500,000 862,900,000 938,600,000 18,400,000 10,900,000 169,200,000 155,000,000 161,700,000 155,000,000 7,500,000 0     211,700,000 132,700,000 1,664,400,000 1,722,600,000 89,700,000 81,900,000 78,000,000 76,100,000 0 0 29,300,000 30,500,000 0 0 0 0     0 0 0 0 123,700,000 119,900,000 123,700,000 122,700,000 2,618,600,000 [4],[5] 2,581,500,000 [6],[7] 711,400,000 [4] 625,400,000 [7] 1,693,700,000 [4] 1,754,200,000 [7] 213,500,000 [4] 201,900,000 [7] 210,100,000 [4] 131,100,000 [7] 210,100,000 131,100,000 0 0 0 0 755,700,000 [4] 754,500,000 [7] 0 0 755,700,000 754,500,000 0 0 220,900,000 [4] 239,600,000 [7] 0 0 220,900,000 239,600,000 0 0 97,400,000 [4] 106,000,000 [7] 0 0 97,400,000 106,000,000 0 0 147,100,000 [4] 145,500,000 [4] 0 0 147,100,000 145,500,000 0 0 100,000,000 [4] 91,500,000 [7] 0 0 100,000,000 91,500,000 0 0 62,600,000 [4] 40,500,000 [7] 0 0 62,600,000 40,500,000 0 0 55,600,000 [4] 64,400,000 [4] 0 0 55,600,000 64,400,000 0 0 43,100,000 [4] 38,000,000 [7] 0 0 43,100,000 38,000,000 0 0 29,000,000 [4] 29,000,000 [7] 0 0 29,000,000 29,000,000 0 0 32,100,000 [4] 16,500,000 0 0 32,100,000 16,500,000 0 0 881,300,000 [4] 949,500,000 [7] 0 0 862,900,000 938,600,000 18,400,000 10,900,000 2,300,000 [4] 2,300,000 1,600,000 1,600,000 700,000 700,000 0 0 84,300,000 [7] 83,300,000 0 0 13,000,000 12,300,000 71,300,000 71,000,000 1,965,800,000 [4] 1,937,200,000 [7] 211,700,000 132,700,000 1,664,400,000 1,722,600,000 89,700,000 81,900,000 152,700,000 [4] 157,000,000 [7] 152,700,000 155,900,000 0 1,100,000 0 0 347,100,000 [4] 336,900,000 [7] 347,000,000 336,800,000 0 0 100,000 100,000 123,300,000 [4] 122,600,000 123,300,000 122,600,000 0 0 0 0 83,000,000 [4] 83,300,000 82,900,000 83,200,000 0 0 100,000 100,000 35,900,000 [4] 34,700,000 35,900,000 34,700,000 0 0 0 0 20,900,000 [7] 20,300,000 20,900,000 20,300,000 0 0 0 0 9,600,000 [4] 8,300,000 [7] 9,600,000 8,300,000 0 0 0 0 74,400,000 [4] 67,700,000 [7] 74,400,000 67,700,000 0 0 0 0 29,300,000 [4] 30,500,000 [7] 0 0 29,300,000 30,500,000 0 0 123,700,000 [4],[5] 119,900,000 [6],[7] 0 [5] 0 [7] 0 [5] 0 [7] 123,700,000 [5] 119,900,000 [7]    
Percentage of investments based on observable inputs                                                                                                                 5.00% 5.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Percentage of Fair Value Investments Using Observable Inputs 92.00%   92.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Other investments 143,000,000   139,600,000                 51,900,000 49,400,000 57,200,000 56,100,000 14,400,000 14,400,000 200,000 0 15,100,000 14,900,000 19,300,000 19,700,000 20,600,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Number of Investments                       9 8 18 19                                               1 1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Securities reclassified to assets held for sale                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     $ 222,200,000 $ 236,300,000
Percentage of private preferred stock 85.00%   85.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
[1] Excludes short-term investments which are deemed to have a Level 1 designation.
[2] Excludes the carrying value of $19.3 million and $20.6 million associated with a tax advantaged federal affordable housing development fund accounted for using the equity method as of March 31, 2014 and 2013, respectively.
[3] Credit ratings are assigned based on the following hierarchy: 1) Standard and Poor’s Financial Services LLC (“Standard and Poor’s”) and 2) Moody’s Investor Service (“Moody’s”).
[4] Fair value includes $222.2 million of fixed maturity investments reclassified to assets held for sale in the March 31, 2014 consolidated balance sheets as part of the Runoff Transaction.
[5] Excludes the carrying value of $19.3 million associated with a tax advantaged federal affordable housing development fund accounted for using the equity method as of March 31, 2014.
[6] Fair value includes $236.3 million of fixed maturity investments reclassified to assets held for sale in the December 31, 2013 consolidated balance sheets as part of the Runoff Transaction.
[7] Excludes the carrying value of $19.7 million associated with a tax advantaged federal affordable housing development fund accounted for using the equity method as of December 31, 2013.