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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Financial Information Regarding Company's Reportable Segments The following table sets forth financial information regarding the Company’s reportable segments for the three and nine months ended September 30, 2018 and 2017:
($ millions)
Three months ended September 30
 
Nine months ended September 30
 
2018
 
2017
 
2018
 
2017
Revenue from external sources:
 
 
 
 
 
 
 
Insurance segments
 
 
 
 
 
 
 
Personal insurance
$
173.0

 
$
144.1

 
$
494.2

 
$
430.6

Commercial insurance
115.2

 
114.3

 
345.7

 
341.8

Specialty insurance
18.6

 
60.6

 
89.3

 
184.8

Total insurance segments
306.8

 
319.0

 
929.2

 
957.2

Investment operations segment
 
 
 
 
 
 
 
Net investment income
20.8

 
18.7

 
62.2

 
56.5

Net investment gain
17.8

 
20.2

 
18.2

 
43.8

Total investment operations segment
38.6

 
38.9

 
80.4

 
100.3

All other
0.6

 
0.5

 
1.8

 
1.7

Total revenue from external sources
346.0

 
358.4

 
1,011.4

 
1,059.2

Intersegment revenue
1.6

 
1.6

 
4.8

 
3.0

Total revenue
347.6

 
360.0

 
1,016.2

 
1,062.2

Reconciling items:
 
 
 
 
 
 
 
Eliminate intersegment revenue
(1.6
)
 
(1.6
)
 
(4.8
)
 
(3.0
)
Total consolidated revenues
$
346.0

 
$
358.4

 
$
1,011.4

 
$
1,059.2

Segment income before federal income tax:
 
 
 
 
 
 
 
Insurance segments SAP underwriting gain (loss)
 
 
 
 
 
 
 
Personal insurance
$
6.9

 
$
(7.4
)
 
$
(4.6
)
 
$
(31.4
)
Commercial insurance
(5.2
)
 
1.3

 
(22.3
)
 
(7.0
)
Specialty insurance
1.9

 
(39.1
)
 
4.5

 
(52.1
)
Total insurance segments gain (loss)
3.6

 
(45.2
)
 
(22.4
)
 
(90.5
)
Investment operations segment
 
 
 
 
 
 
 
Net investment income
20.8

 
18.7

 
62.2

 
56.5

Net investment gain
17.8

 
20.2

 
18.2

 
43.8

Total investment operations segment
38.6

 
38.9

 
80.4

 
100.3

All other
0.1

 
0.1

 
0.3

 
0.2

Total segment income (loss) before reconciling items
42.3

 
(6.2
)
 
58.3

 
10.0

Reconciling items:
 
 
 
 
 
 
 
GAAP expense adjustments
0.8

 
(2.8
)
 
(2.6
)
 
(6.3
)
Interest expense on corporate debt
(1.2
)
 
(1.5
)
 
(4.5
)
 
(4.4
)
Corporate expenses
(0.9
)
 
(0.7
)
 
(5.8
)
 
(2.6
)
Total reconciling items
(1.3
)
 
(5.0
)
 
(12.9
)
 
(13.3
)
Total consolidated income (loss) before federal income tax expense
$
41.0

 
$
(11.2
)
 
$
45.4

 
$
(3.3
)