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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Reconciliation Between Actual Federal Income Tax Benefit and Amount Computed at Indicated Statutory Rate The following table sets forth the reconciliation between actual federal income tax expense and the amount computed at the indicated statutory rate 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
Amount at statutory rate
$
8.6

 
21.0
 %
 
$
(3.9
)
 
35.0
 %
 
$
9.5

 
21.0
 %
 
$
(1.2
)
 
35.0
 %
Tax-exempt interest and dividends received deduction
(0.5
)
 
(1.3
)
 
(1.4
)
 
12.4

 
(1.7
)
 
(3.8
)
 
(4.4
)
 
131.8

Other, net
(0.5
)
 
(1.1
)
 
3.6

 
(32.6
)
 
0.3

 
0.6

 
5.1

 
(151.7
)
Federal income tax expense (benefit)
7.6

 
18.6
 %
 
(1.7
)
 
14.8
 %
 
8.1

 
17.8
 %
 
$
(0.5
)
 
15.1
 %
Deferred tax expense on share-based awards
—

 
 
 
—

 
 
 
—

 
 
 
1.3

 
 
Federal income tax expense (benefit)
$
7.6

 
 
 
$
(1.7
)
 
 
 
$
8.1

 
 
 
$
0.8