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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Cost or Amortized Cost and Fair Value of Available-for-Sale Securities The following tables set forth the cost or amortized cost and fair value of available-for-sale securities by lot at December 31, 2017 and 2016: 
($ millions)
 
Cost or
amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Fair
value
December 31, 2017
Fixed maturities:
 
 
 
 
 
 
 
 
U.S. treasury securities and obligations of U.S. government agencies
 
$
433.8

 
$
9.3

 
$
(6.2
)
 
$
436.9

Obligations of states and political subdivisions
 
507.1

 
19.1

 
(0.4
)
 
525.8

Corporate securities
 
527.5

 
4.5

 
(2.3
)
 
529.7

U.S. government agencies mortgage-backed securities
 
704.7

 
7.1

 
(11.4
)
 
700.4

Total fixed maturities
 
2,173.1

 
40.0

 
(20.3
)
 
2,192.8

Equity securities:
 
 
 
 
 
 
 
 
Large-cap securities
 
62.4

 
35.1

 
(0.7
)
 
96.8

Mutual and exchange traded funds
 
256.2

 
21.6

 
(9.3
)
 
268.5

Total equity securities
 
318.6

 
56.7

 
(10.0
)
 
365.3

Other invested assets
 
25.8

 
30.2

 
—

 
56.0

Total available-for-sale securities
 
$
2,517.5

 
$
126.9

 
$
(30.3
)
 
$
2,614.1

 
 
 
 
 
 
 
 
 
($ millions)
 
Cost or
amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Fair
value
December 31, 2016
Fixed maturities:
 
 
 
 
 
 
 
 
U.S. treasury securities and obligations of U.S. government agencies
 
$
401.9

 
$
8.9

 
$
(6.1
)
 
$
404.7

Obligations of states and political subdivisions
 
634.6

 
12.3

 
(3.2
)
 
643.7

Corporate securities
 
445.7

 
6.1

 
(2.2
)
 
449.6

U.S. government agencies mortgage-backed securities
 
613.7

 
8.5

 
(10.9
)
 
611.3

Total fixed maturities
 
2,095.9

 
35.8

 
(22.4
)
 
2,109.3

Equity securities:
 
 
 
 
 
 
 
 
Large-cap securities
 
108.9

 
32.7

 
(2.6
)
 
139.0

Small-cap securities
 
57.2

 
21.9

 
—

 
79.1

Mutual and exchange traded funds
 
157.0

 
8.5

 
(0.8
)
 
164.7

Total equity securities
 
323.1

 
63.1

 
(3.4
)
 
382.8

Other invested assets
 
25.5

 
19.6

 
—

 
45.1

Total available-for-sale securities
 
$
2,444.5

 
$
118.5

 
$
(25.8
)
 
$
2,537.2

 
 
 
 
 
 
 
 
 
Gross Unrealized Losses and Fair Value on its Investments The following tables set forth the Company’s gross unrealized losses and fair value on its investments by lot, aggregated by investment category and length of time for individual securities that have been in a continuous unrealized loss position at December 31, 2017 and 2016: 
($ millions, except # of positions)
Less than 12 months
 
12 months or more
 
Total
December 31, 2017
Fair
value
 
Unrealized
losses
 
Number
of
positions
 
Fair
value
 
Unrealized
losses
 
Number
of
positions
 
Fair
value
 
Unrealized
losses
 
Number
of
positions
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. treasury securities and obligations of U.S. government agencies
$
102.4

 
$
(0.6
)
 
18

 
$
196.1

 
$
(5.6
)
 
22

 
$
298.5

 
$
(6.2
)
 
40

Obligations of states and political subdivisions
58.6

 
(0.4
)
 
10

 
—

 
—

 
—

 
58.6

 
(0.4
)
 
10

Corporate securities
153.2

 
(1.3
)
 
23

 
67.3

 
(1.0
)
 
10

 
220.5

 
(2.3
)
 
33

U.S. government agencies mortgage-backed securities
188.6

 
(2.9
)
 
31

 
252.2

 
(8.5
)
 
41

 
440.8

 
(11.4
)
 
72

Total fixed maturities
502.8

 
(5.2
)
 
82

 
515.6

 
(15.1
)
 
73

 
1,018.4

 
(20.3
)
 
155

Large-cap equity securities
4.4

 
(0.7
)
 
4

 
—

 
—

 
—

 
4.4

 
(0.7
)
 
4

Mutual and exchange traded funds
66.9

 
(9.3
)
 
1

 
—

 
—

 
—

 
66.9

 
(9.3
)
 
1

Total equity securities
71.3

 
(10.0
)
 
5

 
—

 
—

 
—

 
71.3

 
(10.0
)
 
5

Total temporarily impaired securities
$
574.1

 
$
(15.2
)
 
87

 
$
515.6

 
$
(15.1
)
 
73

 
$
1,089.7

 
$
(30.3
)
 
160

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
($ millions, except # of positions)
Less than 12 months
 
12 months or more
 
Total
December 31, 2016
Fair
value
 
Unrealized
losses
 
Number
of
positions
 
Fair
value
 
Unrealized
losses
 
Number
of
positions
 
Fair
value
 
Unrealized
losses
 
Number
of
positions
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. treasury securities and obligations of U.S. government agencies
$
229.1

 
$
(6.1
)
 
30

 
$
—

 
$
—

 
—

 
$
229.1

 
$
(6.1
)
 
30

Obligations of states and political subdivisions
178.9

 
(3.2
)
 
26

 
—

 
—

 
—

 
178.9

 
(3.2
)
 
26

Corporate securities
102.9

 
(1.4
)
 
16

 
29.4

 
(0.8
)
 
4

 
132.3

 
(2.2
)
 
20

U.S. government agencies mortgage-backed securities
341.7

 
(10.1
)
 
43

 
20.5

 
(0.8
)
 
11

 
362.2

 
(10.9
)
 
54

Total fixed maturities
852.6

 
(20.8
)
 
115

 
49.9

 
(1.6
)
 
15

 
902.5

 
(22.4
)
 
130

Large-cap equity securities
9.1

 
(0.9
)
 
7

 
8.8

 
(1.7
)
 
5

 
17.9

 
(2.6
)
 
12

Mutual and exchange traded funds
29.9

 
(0.8
)
 
2

 
—

 
—

 
—

 
29.9

 
(0.8
)
 
2

Total equity securities
39.0

 
(1.7
)
 
9

 
8.8

 
(1.7
)
 
5

 
47.8

 
(3.4
)
 
14

Total temporarily impaired securities
$
891.6

 
$
(22.5
)
 
124

 
$
58.7

 
$
(3.3
)
 
20

 
$
950.3

 
$
(25.8
)
 
144

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Realized Losses Related to Other-Than-Temporary Impairments The following table sets forth the realized losses related to other-than-temporary impairments on the Company’s investment portfolio recognized for the years ended December 31, 2017, 2016 and 2015:
($ millions)
2017
 
2016
 
2015
Equity securities:
 
 
 
 
 
Large-cap securities
$
(1.5
)
 
$
(0.6
)
 
$
(2.2
)
Small-cap securities
(2.0
)
 
(3.9
)
 
(5.7
)
Fixed maturities
—

 
(2.3
)
 
—

Total other-than-temporary impairments
$
(3.5
)
 
$
(6.8
)
 
$
(7.9
)
 
 
 
 
 
 
Amortized Cost and Fair Value of Available-for-Sale Fixed Maturities by Contractual Maturity The following table sets forth the amortized cost and fair value of available-for-sale fixed maturities by contractual maturity at December 31, 2017:
($ millions)
Amortized
cost
 
Fair
value
Due in 1 year or less
$
5.9

 
$
5.9

Due after 1 year through 5 years
543.8

 
545.0

Due after 5 years through 10 years
419.1

 
420.3

Due after 10 years
499.6

 
521.2

U.S. government agencies mortgage-backed securities
704.7

 
700.4

Total
$
2,173.1

 
$
2,192.8

 
 
 
 
Components of Net Investment Income The following table sets forth the components of net investment income for the years ended December 31, 2017, 2016 and 2015:
($ millions)
2017
 
2016
 
2015
Fixed maturities
$
63.2

 
$
63.4

 
$
61.3

Equity securities
10.5

 
7.3

 
6.5

Cash and cash equivalents, and other
6.3

 
5.6

 
5.9

Investment income
80.0

 
76.3

 
73.7

Investment expenses
1.2

 
1.6

 
2.0

Net investment income
$
78.8

 
$
74.7

 
$
71.7

 
 
 
 
 
 
Realized and Unrealized Holding Gains (Losses) The following table sets forth the realized and unrealized holding gains (losses) on the Company’s investment portfolio for the years ended December 31, 2017, 2016 and 2015:
($ millions)
2017
 
2016
 
2015
Realized gains:
 
 
 
 
 
Fixed maturities
$
2.8

 
$
2.8

 
$
4.6

Equity securities
66.7

 
29.2

 
29.6

Other invested assets
0.2

 
12.1

 
0.2

Total realized gains
69.7

 
44.1

 
34.4

Realized losses:
 
 
 
 
 
Equity securities:
 
 
 
 
 
Sales
(1.1
)
 
(0.8
)
 
(1.8
)
OTTI
(3.5
)
 
(4.5
)
 
(7.9
)
Fixed maturities:
 
 
 
 
 
OTTI
—

 
(2.3
)
 
—

Total realized losses
(4.6
)
 
(7.6
)
 
(9.7
)
Net realized gains on investments
$
65.1

 
$
36.5

 
$
24.7

Change in unrealized holding gains (losses), net of tax:
 
 
 
 
 
Fixed maturities
$
6.3

 
$
(14.4
)
 
$
(32.8
)
Equity securities
(13.0
)
 
14.3

 
(29.5
)
Other invested assets
10.6

 
(8.6
)
 
(1.6
)
Deferred federal income tax
(0.7
)
 
3.0

 
22.4

Change in unrealized holding gains (losses), net of tax
$
3.2

 
$
(5.7
)
 
$
(41.5
)