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Investments (Tables)
 9 Months Ended
Sep. 30, 2014
Investments [Abstract]  
Current and Long-Term Investments, Available-For-Sale
A summary of current and long-term investments, available-for-sale, at September 30, 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
 
 
September 30, 2014:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
342.6

 
$
3.5

 
$
(0.1
)
 
$
(0.2
)
 
$
345.8

 
$
—

Government sponsored securities
127.1

 
0.7

 
(0.1
)
 
(0.7
)
 
127.0

 
—

States, municipalities and political subdivisions, tax-exempt
5,725.1

 
300.2

 
(1.5
)
 
(6.1
)
 
6,017.7

 
—

Corporate securities
8,667.5

 
180.5

 
(56.2
)
 
(34.5
)
 
8,757.3

 
(5.9
)
Options embedded in convertible debt securities
100.4

 
—

 
—

 
—

 
100.4

 
—

Residential mortgage-backed securities
2,173.3

 
62.6

 
(2.0
)
 
(16.4
)
 
2,217.5

 
—

Commercial mortgage-backed securities
502.7

 
7.9

 
(0.5
)
 
(0.7
)
 
509.4

 
—

Other debt securities
705.1

 
7.7

 
(0.7
)
 
(1.2
)
 
710.9

 
—

Total fixed maturity securities
18,343.8

 
563.1

 
(61.1
)
 
(59.8
)
 
18,786.0

 
$
(5.9
)
Equity securities
1,316.6

 
577.1

 
(13.7
)
 
—

 
1,880.0

 
 
Total investments, available-for-sale
$
19,660.4

 
$
1,140.2

 
$
(74.8
)
 
$
(59.8
)
 
$
20,666.0

 
 
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 debt 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 available-for-sale fixed maturity securities and available-for-sale equity securities in an unrealized loss position at September 30, 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
September 30, 2014:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
12

 
$
53.6

 
$
(0.1
)
 
3

 
$
5.0

 
$
(0.2
)
Government sponsored securities
10

 
27.0

 
(0.1
)
 
16

 
31.8

 
(0.7
)
States, municipalities and political subdivisions, tax-exempt
95

 
253.6

 
(1.5
)
 
126

 
320.4

 
(6.1
)
Corporate securities
1,828

 
3,281.2

 
(56.2
)
 
336

 
579.7

 
(34.5
)
Residential mortgage-backed securities
132

 
318.7

 
(2.0
)
 
251

 
483.9

 
(16.4
)
Commercial mortgage-backed securities
37

 
123.9

 
(0.5
)
 
17

 
53.5

 
(0.7
)
Other debt securities
51

 
189.8

 
(0.7
)
 
28

 
74.1

 
(1.2
)
Total fixed maturity securities
2,165

 
4,247.8

 
(61.1
)
 
777

 
1,548.4

 
(59.8
)
Equity securities
510

 
161.5

 
(13.7
)
 
—

 
—

 
—

Total fixed maturity and equity securities
2,675

 
$
4,409.3

 
$
(74.8
)
 
777

 
$
1,548.4

 
$
(59.8
)
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 available-for-sale fixed maturity securities at September 30, 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
$
613.5

 
$
619.9

Due after one year through five years
4,875.4

 
4,991.3

Due after five years through ten years
5,439.9

 
5,588.8

Due after ten years
4,739.0

 
4,859.1

Mortgage-backed securities
2,676.0

 
2,726.9

Total available-for-sale fixed maturity securities
$
18,343.8

 
$
18,786.0
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 and nine months ended September 30, 2014 and 2013 are as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2014
 
2013
 
2014
 
2013
Proceeds
$
2,038.2

 
$
5,442.0

 
$
6,999.6

 
$
10,874.6

Gross realized gains
32.4

 
176.0

 
221.5

 
354.9

Gross realized losses
(6.7
)
 
(80.6
)
 
(88.3
)
 
(188.5
)