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Investments (Tables)
 3 Months Ended
Mar. 31, 2014
Investments [Abstract]  
Current and Long-Term Investments, Available-For-Sale
A summary of current and long-term investments, available-for-sale, at March 31, 2014 and December 31, 2013 is as follows:
 
 
 
 
 
 
 
 
 
Non-Credit
Component of
Other-Than-
Temporary
Impairments
Recognized in
AOCI
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized Losses
 
Estimated
Fair Value
 
 
 
 
Less than
12 Months
 
12 Months
or Greater
 
 
March 31, 2014:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
460.2

 
$
2.7

 
$
(1.3
)
 
$
—

 
$
461.6

 
$
—

Government sponsored securities
168.6

 
0.6

 
(0.5
)
 
(0.5
)
 
168.2

 
—

States, municipalities and political subdivisions, tax-exempt
5,801.9

 
244.4

 
(33.3
)
 
(9.5
)
 
6,003.5

 
—

Corporate securities
8,338.4

 
232.4

 
(54.8
)
 
(14.1
)
 
8,501.9

 
—

Options embedded in convertible securities
97.6

 
—

 
—

 
—

 
97.6

 
—

Residential mortgage-backed securities
2,160.0

 
53.9

 
(26.8
)
 
(5.5
)
 
2,181.6

 
—

Commercial mortgage-backed securities
509.4

 
11.1

 
(1.1
)
 
(0.2
)
 
519.2

 
—

Other debt securities
569.3

 
7.1

 
(2.8
)
 
(0.8
)
 
572.8

 
—

Total fixed maturity securities
18,105.4

 
552.2

 
(120.6
)
 
(30.6
)
 
18,506.4

 
$
—

Equity securities
1,400.8

 
604.3

 
(10.6
)
 
—

 
1,994.5

 
 
Total investments, available-for-sale
$
19,506.2

 
$
1,156.5

 
$
(131.2
)
 
$
(30.6
)
 
$
20,500.9

 
 
December 31, 2013:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
300.8

 
$
2.5

 
$
(3.4
)
 
$
—

 
$
299.9

 
$
—

Government sponsored securities
174.4

 
0.4

 
(1.3
)
 
—

 
173.5

 
—

States, municipalities and political subdivisions, tax-exempt
5,899.5

 
202.9

 
(90.1
)
 
(9.6
)
 
6,002.7

 
(0.6
)
Corporate securities
7,614.1

 
205.2

 
(95.2
)
 
(15.5
)
 
7,708.6

 
(0.1
)
Options embedded in convertible securities
89.2

 
—

 
—

 
—

 
89.2

 
—

Residential mortgage-backed securities
2,269.4

 
48.0

 
(41.4
)
 
(7.1
)
 
2,268.9

 
—

Commercial mortgage-backed securities
479.0

 
10.5

 
(2.6
)
 
(0.3
)
 
486.6

 
—

Other debt securities
456.2

 
5.8

 
(2.5
)
 
(0.8
)
 
458.7

 
(0.1
)
Total fixed maturity securities
17,282.6

 
475.3

 
(236.5
)
 
(33.3
)
 
17,488.1

 
$
(0.8
)
Equity securities
1,195.9

 
578.9

 
(8.0
)
 
—

 
1,766.8

 
 
Total investments, available-for-sale
$
18,478.5

 
$
1,054.2

 
$
(244.5
)
 
$
(33.3
)
 
$
19,254.9

 
 
Aggregate Fair Value and Gross Unrealized Loss of Fixed Maturity Securities and Equity Securities in an Unrealized Loss Position
The following tables summarize for fixed maturity securities and equity securities in an unrealized loss position at March 31, 2014 and December 31, 2013, the aggregate fair value and gross unrealized loss by length of time those securities have been continuously in an unrealized loss position: 
 
Less than 12 Months
 
12 Months or Greater
(Securities are whole amounts)
Number of
Securities
 
Estimated
Fair Value
 
Gross
Unrealized
Loss
 
Number of
Securities
 
Estimated
Fair Value
 
Gross
Unrealized
Loss
March 31, 2014:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
26

 
$
300.2

 
$
(1.3
)
 
—

 
$
—

 
$
—

Government sponsored securities
15

 
28.8

 
(0.5
)
 
5

 
17.0

 
(0.5
)
States, municipalities and political subdivisions, tax-exempt
496

 
1,351.0

 
(33.3
)
 
73

 
168.0

 
(9.5
)
Corporate securities
1,215

 
2,198.9

 
(54.8
)
 
102

 
127.9

 
(14.1
)
Residential mortgage-backed securities
490

 
985.9

 
(26.8
)
 
74

 
115.1

 
(5.5
)
Commercial mortgage-backed securities
37

 
112.4

 
(1.1
)
 
4

 
4.8

 
(0.2
)
Other debt securities
61

 
177.7

 
(2.8
)
 
19

 
17.1

 
(0.8
)
Total fixed maturity securities
2,340

 
5,154.9

 
(120.6
)
 
277

 
449.9

 
(30.6
)
Equity securities
505

 
131.8

 
(10.6
)
 
—

 
—

 
—

Total fixed maturity and equity securities
2,845

 
$
5,286.7

 
$
(131.2
)
 
277

 
$
449.9

 
$
(30.6
)
December 31, 2013:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
27

 
$
179.2

 
$
(3.4
)
 
—

 
$
—

 
$
—

Government sponsored securities
22

 
73.4

 
(1.3
)
 
—

 
—

 
—

States, municipalities and political subdivisions, tax-exempt
806

 
2,070.9

 
(90.1
)
 
42

 
82.4

 
(9.6
)
Corporate securities
1,448

 
2,586.6

 
(95.2
)
 
107

 
81.3

 
(15.5
)
Residential mortgage-backed securities
605

 
1,243.0

 
(41.4
)
 
80

 
116.2

 
(7.1
)
Commercial mortgage-backed securities
52

 
177.7

 
(2.6
)
 
4

 
5.6

 
(0.3
)
Other debt securities
65

 
185.3

 
(2.5
)
 
17

 
16.2

 
(0.8
)
Total fixed maturity securities
3,025

 
6,516.1

 
(236.5
)
 
250

 
301.7

 
(33.3
)
Equity securities
426

 
120.8

 
(8.0
)
 
—

 
—

 
—

Total fixed maturity and equity securities
3,451

 
$
6,636.9

 
$
(244.5
)
 
250

 
$
301.7

 
$
(33.3
)
Amortized Cost and Fair Value of Fixed Maturity Securities, By Contractual Maturity
The amortized cost and fair value of fixed maturity securities at March 31, 2014, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations.
 
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
444.0

 
$
447.4

Due after one year through five years
4,580.9

 
4,714.9

Due after five years through ten years
5,077.6

 
5,230.7

Due after ten years
5,333.5

 
5,412.6

Mortgage-backed securities
2,669.4

 
2,700.8

Total available-for-sale fixed maturity securities
$
18,105.4

 
$
18,506.4
Proceeds and Realized Gains Losses from Investments
Proceeds from fixed maturity securities, equity securities and other invested assets and the related gross realized gains and gross realized losses for the three months ended March 31, 2014 and 2013 are as follows:
 
Three Months Ended 
 March 31
 
2014
 
2013
Proceeds
$
2,401.4

 
$
3,117.6

Gross realized gains
82.9

 
107.0

Gross realized losses
41.2

 
90.2