|
Investments - Schedule of Investments (Details) (USD $)
|
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2012
|
Dec. 31, 2011
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value |
$ 4,787,700,000 |
$ 4,773,400,000 |
| Fair Value |
429,600,000 |
397,300,000 |
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Due in One Year or Less |
75,100,000 |
|
| Due after One Year to Five Years |
505,700,000 |
|
| Due after Five Years to Ten Years |
966,600,000 |
|
| Due after Ten Years |
2,966,900,000 |
|
| Asset-backed Securities Not Due in a Single Maturity Date |
273,400,000 |
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
214,800,000 |
259,500,000 |
| Less Than 12 Months, Unrealized Losses |
(8,000,000) |
(16,700,000) |
| 12 Months or Longer, Fair Value |
71,600,000 |
94,600,000 |
| 12 Months or Longer, Unrealized Losses |
(4,900,000) |
(6,600,000) |
| Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securites in An Unrealized Loss Position, In a Position of 12 Months or Longer |
|
0 |
| Total, Fair Value |
286,400,000 |
354,100,000 |
| Total, Unrealized Losses |
(12,900,000) |
(23,300,000) |
| Available For Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment |
100,000 |
200,000 |
| Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securites in An Unrealized Loss Position |
0 |
|
| Number of Issuers of Available for Sales Securities Continuous Unrealized Loss Possition Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency impairment |
1 |
1 |
|
Fixed Maturities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
4,297,600,000 |
4,266,100,000 |
| Gross Unrealized Gains |
499,600,000 |
518,400,000 |
| Gross Unrealized Losses |
(9,500,000) |
(11,100,000) |
| Fair Value |
4,787,700,000 |
4,773,400,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
190,400,000 |
173,500,000 |
| Less Than 12 Months, Unrealized Losses |
(5,000,000) |
(5,200,000) |
| 12 Months or Longer, Fair Value |
66,300,000 |
89,500,000 |
| 12 Months or Longer, Unrealized Losses |
(4,500,000) |
(5,900,000) |
| Total, Fair Value |
256,700,000 |
263,000,000 |
| Total, Unrealized Losses |
(9,500,000) |
(11,100,000) |
|
US Government and Government Agencies and Authorities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
429,100,000 |
439,400,000 |
| Gross Unrealized Gains |
45,900,000 |
52,300,000 |
| Gross Unrealized Losses |
(600,000) |
0 |
| Fair Value |
474,400,000 |
491,700,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
19,700,000 |
1,300,000 |
| Less Than 12 Months, Unrealized Losses |
(600,000) |
0 |
| 12 Months or Longer, Fair Value |
0 |
0 |
| 12 Months or Longer, Unrealized Losses |
0 |
0 |
| Total, Fair Value |
19,700,000 |
1,300,000 |
| Total, Unrealized Losses |
(600,000) |
0 |
|
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Asset-backed Securities Not Due in a Single Maturity Date |
241,600,000 |
|
|
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Asset-backed Securities Not Due in a Single Maturity Date |
26,000,000 |
|
|
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Asset-backed Securities Not Due in a Single Maturity Date |
800,000 |
|
|
Other Issuers [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Asset-backed Securities Not Due in a Single Maturity Date |
5,000,000 |
|
|
States and Political Subdivisions [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
1,666,600,000 |
1,705,000,000 |
| Gross Unrealized Gains |
159,300,000 |
148,400,000 |
| Gross Unrealized Losses |
(500,000) |
(800,000) |
| Fair Value |
1,825,400,000 |
1,852,600,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
0 |
2,000,000 |
| Less Than 12 Months, Unrealized Losses |
0 |
0 |
| 12 Months or Longer, Fair Value |
12,300,000 |
12,000,000 |
| 12 Months or Longer, Unrealized Losses |
(500,000) |
(800,000) |
| Total, Fair Value |
12,300,000 |
14,000,000 |
| Total, Unrealized Losses |
(500,000) |
(800,000) |
|
Bonds and Notes [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
2,120,400,000 |
2,040,100,000 |
| Gross Unrealized Gains |
288,600,000 |
311,600,000 |
| Gross Unrealized Losses |
(7,500,000) |
(9,400,000) |
| Fair Value |
2,401,500,000 |
2,342,300,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
170,200,000 |
169,600,000 |
| Less Than 12 Months, Unrealized Losses |
(4,200,000) |
(5,100,000) |
| 12 Months or Longer, Fair Value |
51,300,000 |
74,700,000 |
| 12 Months or Longer, Unrealized Losses |
(3,300,000) |
(4,300,000) |
| Total, Fair Value |
221,500,000 |
244,300,000 |
| Total, Unrealized Losses |
(7,500,000) |
(9,400,000) |
|
Redeemable Preferred Stocks [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
76,800,000 |
76,700,000 |
| Gross Unrealized Gains |
4,800,000 |
5,100,000 |
| Gross Unrealized Losses |
(200,000) |
(100,000) |
| Fair Value |
81,400,000 |
81,700,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
500,000 |
600,000 |
| Less Than 12 Months, Unrealized Losses |
(200,000) |
(100,000) |
| 12 Months or Longer, Fair Value |
100,000 |
100,000 |
| 12 Months or Longer, Unrealized Losses |
0 |
0 |
| Total, Fair Value |
600,000 |
700,000 |
| Total, Unrealized Losses |
(200,000) |
(100,000) |
|
Mortgage and Asset-backed [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
4,700,000 |
4,900,000 |
| Gross Unrealized Gains |
1,000,000 |
1,000,000 |
| Gross Unrealized Losses |
(700,000) |
(800,000) |
| Fair Value |
5,000,000 |
5,100,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
0 |
0 |
| Less Than 12 Months, Unrealized Losses |
0 |
0 |
| 12 Months or Longer, Fair Value |
2,600,000 |
2,700,000 |
| 12 Months or Longer, Unrealized Losses |
(700,000) |
(800,000) |
| Total, Fair Value |
2,600,000 |
2,700,000 |
| Total, Unrealized Losses |
(700,000) |
(800,000) |
|
Collateralized Debt Obligations [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value |
2,900,000 |
2,900,000 |
|
Non-governmental Residential Mortgage-backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value |
1,700,000 |
1,700,000 |
|
Other Asset Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value |
400,000 |
400,000 |
|
Commercial Mortgage Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value |
|
100,000 |
|
Equity Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
380,400,000 |
367,300,000 |
| Gross Unrealized Gains |
52,600,000 |
42,200,000 |
| Gross Unrealized Losses |
(3,400,000) |
(12,200,000) |
| Fair Value |
429,600,000 |
397,300,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
24,400,000 |
86,000,000 |
| Less Than 12 Months, Unrealized Losses |
(3,000,000) |
(11,500,000) |
| 12 Months or Longer, Fair Value |
5,300,000 |
5,100,000 |
| 12 Months or Longer, Unrealized Losses |
(400,000) |
(700,000) |
| Total, Fair Value |
29,700,000 |
91,100,000 |
| Total, Unrealized Losses |
(3,400,000) |
(12,200,000) |
|
Preferred Stock Finance, Insurance and Real Estate [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
94,400,000 |
94,400,000 |
| Gross Unrealized Gains |
3,300,000 |
1,000,000 |
| Gross Unrealized Losses |
(300,000) |
(8,700,000) |
| Fair Value |
97,400,000 |
86,700,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
0 |
54,900,000 |
| Less Than 12 Months, Unrealized Losses |
0 |
(8,100,000) |
| 12 Months or Longer, Fair Value |
2,400,000 |
2,200,000 |
| 12 Months or Longer, Unrealized Losses |
(300,000) |
(600,000) |
| Total, Fair Value |
2,400,000 |
57,100,000 |
| Total, Unrealized Losses |
(300,000) |
(8,700,000) |
|
Preferred Stocks Other Industries [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
18,100,000 |
18,000,000 |
| Gross Unrealized Gains |
3,400,000 |
2,600,000 |
| Gross Unrealized Losses |
(300,000) |
(100,000) |
| Fair Value |
21,200,000 |
20,500,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
1,800,000 |
1,800,000 |
| Less Than 12 Months, Unrealized Losses |
(200,000) |
0 |
| 12 Months or Longer, Fair Value |
2,800,000 |
2,800,000 |
| 12 Months or Longer, Unrealized Losses |
(100,000) |
(100,000) |
| Total, Fair Value |
4,600,000 |
4,600,000 |
| Total, Unrealized Losses |
(300,000) |
(100,000) |
|
Common Stocks Manufacturing [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
65,300,000 |
64,600,000 |
| Gross Unrealized Gains |
21,900,000 |
18,900,000 |
| Gross Unrealized Losses |
(100,000) |
(100,000) |
| Fair Value |
87,100,000 |
83,400,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
1,200,000 |
1,500,000 |
| Less Than 12 Months, Unrealized Losses |
(100,000) |
(100,000) |
| 12 Months or Longer, Fair Value |
0 |
100,000 |
| 12 Months or Longer, Unrealized Losses |
0 |
0 |
| Total, Fair Value |
1,200,000 |
1,600,000 |
| Total, Unrealized Losses |
(100,000) |
(100,000) |
|
Common Stocks Other Industries [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
41,400,000 |
41,400,000 |
| Gross Unrealized Gains |
8,900,000 |
7,400,000 |
| Gross Unrealized Losses |
(600,000) |
(1,800,000) |
| Fair Value |
49,700,000 |
47,000,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
5,400,000 |
10,700,000 |
| Less Than 12 Months, Unrealized Losses |
(600,000) |
(1,800,000) |
| 12 Months or Longer, Fair Value |
100,000 |
0 |
| 12 Months or Longer, Unrealized Losses |
0 |
0 |
| Total, Fair Value |
5,500,000 |
10,700,000 |
| Total, Unrealized Losses |
(600,000) |
(1,800,000) |
|
Exchange Traded Funds [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
66,000,000 |
66,000,000 |
| Gross Unrealized Gains |
1,700,000 |
600,000 |
| Gross Unrealized Losses |
0 |
0 |
| Fair Value |
67,700,000 |
66,600,000 |
|
Limited Liability Companies and Limited Partnerships [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Amortized Cost Basis |
95,200,000 |
82,900,000 |
| Gross Unrealized Gains |
13,400,000 |
11,700,000 |
| Gross Unrealized Losses |
(2,100,000) |
(1,500,000) |
| Fair Value |
106,500,000 |
93,100,000 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Less Than 12 Months, Fair Value |
16,000,000 |
17,100,000 |
| Less Than 12 Months, Unrealized Losses |
(2,100,000) |
(1,500,000) |
| 12 Months or Longer, Fair Value |
0 |
0 |
| 12 Months or Longer, Unrealized Losses |
0 |
0 |
| Total, Fair Value |
16,000,000 |
17,100,000 |
| Total, Unrealized Losses |
(2,100,000) |
(1,500,000) |
|
External Credit Rating, Investment Grade [Member] | Fixed Maturities [Member]
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Total, Unrealized Losses |
(6,500,000) |
(5,700,000) |
|
External Credit Rating, Non Investment Grade [Member]
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment |
(100,000) |
(200,000) |
| Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average |
3.00% |
4.00% |
|
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities [Member]
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
| Total, Unrealized Losses |
$ (3,000,000) |
$ (5,400,000) |