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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Current and Long-Term Investments, Available-For-Sale
A summary of current and long-term investments, available-for-sale, at September 30, 2017 and December 31, 2016 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, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
578.4

 
$
1.2

 
$
(2.7
)
 
$
(0.4
)
 
$
576.5

 
$
—

Government sponsored securities
71.3

 
0.3

 
(0.2
)
 
(0.1
)
 
71.3

 
—

States, municipalities and political subdivisions, tax-exempt
5,675.4

 
207.5

 
(2.4
)
 
(8.0
)
 
5,872.5

 
—

Corporate securities
8,967.2

 
234.3

 
(18.4
)
 
(15.2
)
 
9,167.9

 
(0.2
)
Residential mortgage-backed securities
2,488.0

 
42.7

 
(7.0
)
 
(5.5
)
 
2,518.2

 
—

Commercial mortgage-backed securities
79.1

 
0.9

 
—

 
(2.1
)
 
77.9

 
—

Other securities
934.3

 
14.1

 
(0.7
)
 
(1.4
)
 
946.3

 
—

Total fixed maturity securities
18,793.7

 
501.0

 
(31.4
)
 
(32.7
)
 
19,230.6

 
$
(0.2
)
Equity securities
1,061.0

 
439.9

 
(16.0
)
 
—

 
1,484.9

 
 
Total investments, available-for-sale
$
19,854.7

 
$
940.9

 
$
(47.4
)
 
$
(32.7
)
 
$
20,715.5

 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
561.7

 
$
2.5

 
$
(5.7
)
 
$
—

 
$
558.5

 
$
—

Government sponsored securities
40.1

 
0.3

 
(0.3
)
 
(0.1
)
 
40.0

 
—

States, municipalities and political subdivisions, tax-exempt
6,024.6

 
139.1

 
(55.2
)
 
(3.2
)
 
6,105.3

 
(3.8
)
Corporate securities
8,011.7

 
159.5

 
(49.5
)
 
(27.1
)
 
8,094.6

 
(3.4
)
Residential mortgage-backed securities
1,916.9

 
32.3

 
(15.3
)
 
(4.6
)
 
1,929.3

 
—

Commercial mortgage-backed securities
216.8

 
1.2

 
(0.3
)
 
(3.4
)
 
214.3

 
—

Other securities
744.6

 
6.4

 
(1.5
)
 
(4.0
)
 
745.5

 
—

Total fixed maturity securities
17,516.4

 
341.3

 
(127.8
)
 
(42.4
)
 
17,687.5

 
$
(7.2
)
Equity securities
1,103.3

 
407.3

 
(10.7
)
 
—

 
1,499.9

 
 
Total investments, available-for-sale
$
18,619.7

 
$
748.6

 
$
(138.5
)
 
$
(42.4
)
 
$
19,187.4

 
 
Aggregate Fair Value and Gross Unrealized Loss of Fixed Maturity Securities and Equity Securities in an Unrealized Loss Position
For available-for-sale securities in an unrealized loss position at September 30, 2017 and December 31, 2016, the following table summarizes the aggregate fair values and gross unrealized losses by length of time those securities have continuously been 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, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
43

 
$
462.3

 
$
(2.7
)
 
4

 
$
21.0

 
$
(0.4
)
Government sponsored securities
17

 
21.7

 
(0.2
)
 
6

 
4.6

 
(0.1
)
States, municipalities and political subdivisions, tax-exempt
257

 
417.2

 
(2.4
)
 
194

 
362.9

 
(8.0
)
Corporate securities
751

 
1,454.1

 
(18.4
)
 
259

 
467.0

 
(15.2
)
Residential mortgage-backed securities
369

 
969.9

 
(7.0
)
 
153

 
213.5

 
(5.5
)
Commercial mortgage-backed securities
7

 
9.5

 
—

 
11

 
25.6

 
(2.1
)
Other securities
66

 
199.7

 
(0.7
)
 
21

 
33.3

 
(1.4
)
Total fixed maturity securities
1,510

 
3,534.4

 
(31.4
)
 
648

 
1,127.9

 
(32.7
)
Equity securities
458

 
128.5

 
(16.0
)
 
—

 
—

 
—

Total investments, available-for-sale
1,968

 
$
3,662.9

 
$
(47.4
)
 
648

 
$
1,127.9

 
$
(32.7
)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
51

 
$
359.9

 
$
(5.7
)
 
—

 
$
—

 
$
—

Government sponsored securities
18

 
26.4

 
(0.3
)
 
1

 
1.0

 
(0.1
)
States, municipalities and political subdivisions, tax-exempt
1,022

 
1,849.0

 
(55.2
)
 
28

 
60.7

 
(3.2
)
Corporate securities
1,272

 
2,640.6

 
(49.5
)
 
203

 
422.8

 
(27.1
)
Residential mortgage-backed securities
430

 
905.8

 
(15.3
)
 
114

 
136.9

 
(4.6
)
Commercial mortgage-backed securities
19

 
61.2

 
(0.3
)
 
24

 
60.8

 
(3.4
)
Other securities
66

 
144.3

 
(1.5
)
 
55

 
133.8

 
(4.0
)
Total fixed maturity securities
2,878

 
5,987.2

 
(127.8
)
 
425

 
816.0

 
(42.4
)
Equity securities
452

 
233.1

 
(10.7
)
 
—

 
—

 
—

Total investments, available-for-sale
3,330

 
$
6,220.3

 
$
(138.5
)
 
425

 
$
816.0

 
$
(42.4
)
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, 2017, 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
$
409.6

 
$
410.7

Due after one year through five years
4,950.9

 
5,043.5

Due after five years through ten years
5,326.3

 
5,476.7

Due after ten years
5,539.8

 
5,703.6

Mortgage-backed securities
2,567.1

 
2,596.1

Total available-for-sale fixed maturity securities
$
18,793.7

 
$
19,230.6
Proceeds and Realized Gains and Losses from Investments
Proceeds from sales, maturities, calls or redemptions of 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, 2017 and 2016 are as follows:
 
Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2017
 
2016
 
2017
 
2016
Proceeds
$
3,384.6

 
$
2,921.2

 
$
9,840.4

 
$
8,463.8

Gross realized gains
144.4

 
113.4

 
255.1

 
343.2

Gross realized losses
(17.2
)
 
(13.0
)
 
(67.5
)
 
(136.7
)
Securities Lending Programs
The remaining contractual maturity of our securities lending agreements at September 30, 2017 is as follows:
 
Overnight and Continuous
 
Less than 30 days
 
Total
Securities lending transactions
 
 
 
 
 
United States Government securities
$
26.1

 
$
8.7

 
$
34.8

Corporate securities
720.7

 
—

 
720.7

Equity securities
150.9

 
—

 
150.9

Total
$
897.7

 
$
8.7

 
$
906.4