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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments Schedule [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The following tables present the composition of our investment portfolio by major security type, consistent with our classification of how we manage, monitor, and measure the portfolio. The net holding period gains (losses) represent the amounts realized on our hybrid securities only.
 
($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
4,612.2

 
$
3.0

 
$
(20.2
)
 
$
0

 
$
4,595.0

 
17.0
%
State and local government obligations
2,332.2

 
35.0

 
(3.1
)
 
0.1

 
2,364.2

 
8.7

Foreign government obligations
24.2

 
0

 
0

 
0

 
24.2

 
0.1

Corporate debt securities
5,195.7

 
32.7

 
(4.2
)
 
1.4

 
5,225.6

 
19.4

Residential mortgage-backed securities
911.3

 
12.2

 
(3.2
)
 
0

 
920.3

 
3.4

Agency residential pass-through obligations
35.7

 
0

 
(0.4
)
 
0

 
35.3

 
0.1

Commercial mortgage-backed securities
2,763.7

 
17.0

 
(12.8
)
 
0

 
2,767.9

 
10.3

Other asset-backed securities
2,485.6

 
6.4

 
(2.0
)
 
0.2

 
2,490.2

 
9.2

Redeemable preferred stocks
222.5

 
16.4

 
(2.0
)
 
0.4

 
237.3

 
0.9

Total fixed maturities
18,583.1

 
122.7

 
(47.9
)
 
2.1

 
18,660.0

 
69.1

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
700.6

 
120.4

 
(7.3
)
 
0

 
813.7

 
3.0

Common equities
1,485.5

 
1,729.5

 
(5.5
)
 
0

 
3,209.5

 
11.9

Short-term investments
4,311.5

 
0

 
0

 
0

 
4,311.5

 
16.0

Total portfolio1,2
$
25,080.7

 
$
1,972.6

 
$
(60.7
)
 
$
2.1

 
$
26,994.7

 
100.0
%

($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
726.0

 
$
8.9

 
$
(0.3
)
 
$
0

 
$
734.6

 
3.1
%
State and local government obligations
2,508.9

 
58.7

 
(1.6
)
 
0

 
2,566.0

 
10.9

Foreign government obligations
25.4

 
0

 
0

 
0

 
25.4

 
0.1

Corporate debt securities
4,327.5

 
76.9

 
(1.8
)
 
0.7

 
4,403.3

 
18.7

Residential mortgage-backed securities
1,582.6

 
25.3

 
(15.5
)
 
1.8

 
1,594.2

 
6.8

Agency residential pass-through obligations
43.6

 
0.5

 
0

 
0

 
44.1

 
0.2

Commercial mortgage-backed securities
2,249.4

 
35.1

 
(6.1
)
 
0

 
2,278.4

 
9.7

Other asset-backed securities
2,037.5

 
7.9

 
(0.3
)
 
0.3

 
2,045.4

 
8.7

Redeemable preferred stocks
207.1

 
19.6

 
(1.2
)
 
0

 
225.5

 
1.0

Total fixed maturities
13,708.0

 
232.9

 
(26.8
)
 
2.8

 
13,916.9

 
59.2

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
726.6

 
146.2

 
(13.9
)
 
1.2

 
860.1

 
3.6

Common equities
1,576.1

 
1,296.3

 
(4.4
)
 
0

 
2,868.0

 
12.2

Short-term investments
5,876.2

 
0

 
0

 
0

 
5,876.2

 
25.0

Total portfolio1,2
$
21,886.9

 
$
1,675.4

 
$
(45.1
)
 
$
4.0

 
$
23,521.2

 
100.0
%
 
($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
2,899.2

 
$
0

 
$
(29.1
)
 
$
0

 
$
2,870.1

 
12.2
%
State and local government obligations
2,509.5

 
13.8

 
(20.7
)
 
0

 
2,502.6

 
10.7

Foreign government obligations
24.5

 
0

 
0

 
0

 
24.5

 
0.1

Corporate debt securities
4,557.8

 
17.3

 
(24.3
)
 
0.1

 
4,550.9

 
19.4

Residential mortgage-backed securities
1,448.5

 
23.7

 
(15.0
)
 
1.5

 
1,458.7

 
6.2

Agency residential pass-through obligations
41.2

 
0

 
(0.6
)
 
0

 
40.6

 
0.2

Commercial mortgage-backed securities
2,266.9

 
12.0

 
(25.5
)
 
0

 
2,253.4

 
9.6

Other asset-backed securities
2,350.7

 
4.6

 
(4.4
)
 
0.2

 
2,351.1

 
10.0

Redeemable preferred stocks
188.8

 
5.1

 
(2.0
)
 
0

 
191.9

 
0.8

Total fixed maturities
16,287.1

 
76.5

 
(121.6
)
 
1.8

 
16,243.8

 
69.2

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
734.2

 
135.4

 
(16.1
)
 
0

 
853.5

 
3.6

Common equities
1,437.5

 
1,377.0

 
(2.1
)
 
0

 
2,812.4

 
12.0

Short-term investments
3,572.9

 
0

 
0

 
0

 
3,572.9

 
15.2

Total portfolio1,2
$
22,031.7

 
$
1,588.9

 
$
(139.8
)
 
$
1.8

 
$
23,482.6

 
100.0
%

1Our portfolio reflects the effect of unsettled security transactions and collateral on open derivative positions; at September 30, 2017 and 2016, and December 31, 2016, we had $238.3 million, $185.3 million, and $27.8 million, respectively, included in “other liabilities.”
2The total fair value of the portfolio at September 30, 2017 and 2016, and December 31, 2016, included $1.1 billion, $1.0 billion, and $1.3 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.
Hybrid Instruments Table [Table Text Block]
Included in our fixed-maturity and equity securities are hybrid securities, which are reported at fair value:

 
September 30,
 
December 31,
2016

(millions)
2017

 
2016

 
Fixed maturities:
 
 
 
 
 
State and local government obligations
$
2.4

 
$
0

 
$
0

Corporate debt securities
114.9

 
31.2

 
40.1

Residential mortgage-backed securities
0

 
175.3

 
170.5

Other asset-backed securities
7.1

 
9.5

 
8.9

Redeemable preferred stocks
35.5

 
0

 
0

Total fixed maturities
159.9

 
216.0

 
219.5

Equity securities:
 
 
 
 
 
Nonredeemable preferred stocks
0

 
13.6

 
0

Total hybrid securities
$
159.9

 
$
229.6

 
$
219.5
Investments Classified by Contractual Maturity Date [Table Text Block]
The composition of fixed maturities by maturity at September 30, 2017, was:
 
(millions)
Cost

 
Fair Value

Less than one year
$
4,088.1

 
$
4,105.7

One to five years
11,476.9

 
11,508.8

Five to ten years
2,873.9

 
2,901.3

Ten years or greater
144.2

 
144.2

Total
$
18,583.1

 
$
18,660.0

 
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables show the composition of gross unrealized losses by major security type and by the length of time that individual securities have been in a continuous unrealized loss position:
 
 
Total No. of Sec.

Total
Fair
Value

Gross Unrealized Losses

Less than 12 Months
 
12 Months or Greater
($ in millions)
No. of Sec.

Fair
Value

Unrealized Losses

 
No. of Sec.

Fair
Value

Unrealized Losses

September 30, 2017
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
54

$
3,804.0

$
(20.2
)
31

$
2,302.2

$
(7.1
)
 
23

$
1,501.8

$
(13.1
)
State and local government obligations
169

610.4

(3.1
)
40

141.0

(0.7
)
 
129

469.4

(2.4
)
Corporate debt securities
113

1,523.8

(4.2
)
59

636.0

(1.1
)
 
54

887.8

(3.1
)
Residential mortgage-backed securities
126

308.8

(3.2
)
14

37.4

(0.1
)
 
112

271.4

(3.1
)
Agency residential pass-through obligations
65

32.7

(0.4
)
12

1.8

0

 
53

30.9

(0.4
)
Commercial mortgage-backed securities
105

1,588.9

(12.8
)
61

1,073.5

(4.6
)
 
44

515.4

(8.2
)
Other asset-backed securities
148

1,393.2

(2.0
)
103

920.8

(1.0
)
 
45

472.4

(1.0
)
Redeemable preferred stocks
2

21.4

(2.0
)
1

10.9

0

 
1

10.5

(2.0
)
Total fixed maturities
782

9,283.2

(47.9
)
321

5,123.6

(14.6
)
 
461

4,159.6

(33.3
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
3

72.4

(7.3
)
0

0

0

 
3

72.4

(7.3
)
Common equities
67

52.0

(5.5
)
62

49.3

(4.9
)
 
5

2.7

(0.6
)
Total equity securities
70

124.4

(12.8
)
62

49.3

(4.9
)
 
8

75.1

(7.9
)
Total portfolio
852

$
9,407.6

$
(60.7
)
383

$
5,172.9

$
(19.5
)
 
469

$
4,234.7

$
(41.2
)
 
 
Total No. of Sec.

Total
Fair
Value

Gross Unrealized Losses

Less than 12 Months
 
12 Months or Greater
($ in millions)
No. of Sec.

Fair
Value

Unrealized Losses

 
No. of Sec.

Fair
Value

Unrealized Losses

September 30, 2016
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
4

$
104.8

$
(0.3
)
4

$
104.8

$
(0.3
)
 
0

$
0

$
0

State and local government obligations
151

512.0

(1.6
)
117

409.6

(1.0
)
 
34

102.4

(0.6
)
Corporate debt securities
52

598.3

(1.8
)
42

541.5

(0.8
)
 
10

56.8

(1.0
)
Residential mortgage-backed securities
138

915.8

(15.5
)
26

108.8

(0.4
)
 
112

807.0

(15.1
)
Agency residential pass-through obligations
15

4.2

0

7

1.9

0

 
8

2.3

0

Commercial mortgage-backed securities
56

610.6

(6.1
)
17

194.7

(1.7
)
 
39

415.9

(4.4
)
Other asset-backed securities
43

488.7

(0.3
)
16

219.5

(0.1
)
 
27

269.2

(0.2
)
Redeemable preferred stocks
2

31.8

(1.2
)
0

0

0

 
2

31.8

(1.2
)
Total fixed maturities
461

3,266.2

(26.8
)
229

1,580.8

(4.3
)
 
232

1,685.4

(22.5
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
7

187.5

(13.9
)
1

9.9

(0.2
)
 
6

177.6

(13.7
)
Common equities
86

53.4

(4.4
)
83

49.5

(4.2
)
 
3

3.9

(0.2
)
Total equity securities
93

240.9

(18.3
)
84

59.4

(4.4
)
 
9

181.5

(13.9
)
Total portfolio
554

$
3,507.1

$
(45.1
)
313

$
1,640.2

$
(8.7
)
 
241

$
1,866.9

$
(36.4
)
 
Total No. of Sec.

Total
Fair
Value

Gross Unrealized Losses

Less than 12 Months
 
12 Months or Greater
($ in millions)
No. of Sec.

Fair
Value

Unrealized Losses

 
No. of Sec.

Fair
Value

Unrealized Losses

December 31, 2016
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
30

$
2,774.0

$
(29.1
)
30

$
2,774.0

$
(29.1
)
 
0

$
0

$
0

State and local government obligations
618

1,497.9

(20.7
)
584

1,404.3

(19.6
)
 
34

93.6

(1.1
)
Corporate debt securities
184

2,615.1

(24.3
)
175

2,559.9

(24.0
)
 
9

55.2

(0.3
)
Residential mortgage-backed securities
178

917.7

(15.0
)
69

175.8

(1.1
)
 
109

741.9

(13.9
)
Agency residential pass-through obligations
55

36.0

(0.6
)
48

33.9

(0.6
)
 
7

2.1

0

Commercial mortgage-backed securities
111

1,347.3

(25.5
)
85

1,061.2

(22.9
)
 
26

286.1

(2.6
)
Other asset-backed securities
103

1,605.2

(4.4
)
89

1,423.3

(3.9
)
 
14

181.9

(0.5
)
Redeemable preferred stocks
2

31.0

(2.0
)
0

0

0

 
2

31.0

(2.0
)
Total fixed maturities
1,281

10,824.2

(121.6
)
1,080

9,432.4

(101.2
)
 
201

1,391.8

(20.4
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
13

329.6

(16.1
)
8

175.2

(3.8
)
 
5

154.4

(12.3
)
Common equities
75

22.1

(2.1
)
69

19.7

(1.7
)
 
6

2.4

(0.4
)
Total equity securities
88

351.7

(18.2
)
77

194.9

(5.5
)
 
11

156.8

(12.7
)
Total portfolio
1,369

$
11,175.9

$
(139.8
)
1,157

$
9,627.3

$
(106.7
)
 
212

$
1,548.6

$
(33.1
)
Non Credit Portion Of Other Than Temporary Impairment Recorded In Accumulated Other Comprehensive Income Table [Table Text Block]
The following table shows the total non-credit portion of the OTTI recorded in accumulated other comprehensive income, reflecting the original non-credit loss at the time the credit impairment was determined (i.e., unadjusted for valuation changes subsequent to the original write-down):
 
 
September 30,
 
December 31,
2016

(millions)
2017

 
2016

 
Fixed maturities:
 
 
 
 
 
Residential mortgage-backed securities
$
(19.7
)
 
$
(43.3
)
 
$
(43.3
)
Commercial mortgage-backed securities
(0.4
)
 
(0.6
)
 
(0.6
)
Total fixed maturities
$
(20.1
)
 
$
(43.9
)
 
$
(43.9
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The following tables provide rollforwards of the amounts related to credit losses recognized in earnings for the periods ended September 30, 2017 and 2016, for which a portion of the OTTI losses were also recognized in accumulated other comprehensive income at the time the credit impairments were determined and recognized: 
 
Three Months Ended September 30, 2017
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at June 30, 2017
$
0.2

 
$
0.1

 
$
0.3

Credit losses for which an OTTI was not previously recognized
0

 
0.4

 
0.4

Reductions for securities sold/matured
0

 
0

 
0

Change in recoveries of future cash flows expected to be collected1
0

 
0

 
0

Balance at September 30, 2017
$
0.2

 
$
0.5

 
$
0.7

 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at December 31, 2016
$
11.1

 
$
0.4

 
$
11.5

Credit losses for which an OTTI was not previously recognized
0

 
0.4

 
0.4

Reductions for securities sold/matured
(10.9
)
 
(0.3
)
 
(11.2
)
Change in recoveries of future cash flows expected to be collected1
0

 
0

 
0

Balance at September 30, 2017
$
0.2

 
$
0.5

 
$
0.7

 
Three Months Ended September 30, 2016
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at June 30, 2016
$
11.8

 
$
0.4

 
$
12.2

Credit losses for which an OTTI was not previously recognized
0

 
0

 
0

Reductions for securities sold/matured
0

 
0

 
0

Change in recoveries of future cash flows expected to be collected1
(0.3
)
 
0

 
(0.3
)
Balance at September 30, 2016
$
11.5

 
$
0.4

 
$
11.9

 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at December 31, 2015
$
12.4

 
$
0.4

 
$
12.8

Credit losses for which an OTTI was not previously recognized
0

 
0

 
0

Reductions for securities sold/matured
0

 
0

 
0

Change in recoveries of future cash flows expected to be collected1
(0.9
)
 
0

 
(0.9
)
Balance at September 30, 2016
$
11.5

 
$
0.4

 
$
11.9

1Reflects the current period change in the expected recovery of prior impairments that will be accreted into income over the remaining life of the security.
Realized Gain (Loss) on Investments [Table Text Block]
The components of net realized gains (losses) for the three and nine months ended September 30, were:
 
Three Months
 
Nine Months
(millions)
2017

 
2016

 
2017

 
2016

Gross realized gains on security sales
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
U.S. government obligations
$
0.9

 
$
6.4

 
$
5.8

 
$
24.1

State and local government obligations
4.0

 
0.6

 
7.1

 
16.0

Corporate and other debt securities
5.1

 
15.6

 
16.5

 
38.1

Residential mortgage-backed securities
2.8

 
0.2

 
23.8

 
1.9

Agency residential pass-through obligations
0

 
0

 
0

 
0.1

Commercial mortgage-backed securities
0

 
5.5

 
2.4

 
12.0

Other asset-backed securities
0

 
0

 
0.3

 
0

Redeemable preferred stocks
7.7

 
0

 
8.0

 
0

Total fixed maturities
20.5

 
28.3

 
63.9

 
92.2

Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
3.0

 
4.9

 
54.6

 
11.9

Common equities
5.7

 
14.4

 
23.0

 
43.3

Short-term investments
0

 
0.1

 
0

 
0.1

   Subtotal gross realized gains on security sales
29.2

 
47.7

 
141.5


147.5

Gross realized losses on security sales
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
U.S. government obligations
(1.0
)
 
(0.8
)
 
(4.6
)
 
(1.2
)
State and local government obligations
0

 
0

 
(0.1
)
 
(1.6
)
Corporate and other debt securities
(1.8
)
 
(0.2
)
 
(4.6
)
 
(1.9
)
Residential mortgage-backed securities
(0.1
)
 
0

 
(0.4
)
 
0

Agency residential pass-through obligations
0

 
0

 
0

 
(0.2
)
Commercial mortgage-backed securities
(0.5
)
 
0

 
(3.6
)
 
(4.1
)
Redeemable preferred stocks
(6.4
)
 
(6.5
)
 
(6.4
)
 
(6.5
)
Total fixed maturities
(9.8
)
 
(7.5
)
 
(19.7
)
 
(15.5
)
Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
(0.1
)
 
(0.4
)
 
(5.9
)
 
(3.1
)
Common equities
(0.2
)
 
(0.3
)
 
(0.3
)
 
(5.3
)
   Subtotal gross realized losses on security sales
(10.1
)
 
(8.2
)
 
(25.9
)
 
(23.9
)
Net realized gains (losses) on security sales
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
U.S. government obligations
(0.1
)
 
5.6

 
1.2

 
22.9

State and local government obligations
4.0

 
0.6

 
7.0

 
14.4

Corporate and other debt securities
3.3

 
15.4

 
11.9

 
36.2

Residential mortgage-backed securities
2.7

 
0.2

 
23.4

 
1.9

Agency residential pass-through obligations
0

 
0

 
0

 
(0.1
)
Commercial mortgage-backed securities
(0.5
)
 
5.5

 
(1.2
)
 
7.9

Other asset-backed securities
0

 
0

 
0.3

 
0

Redeemable preferred stocks
1.3

 
(6.5
)
 
1.6

 
(6.5
)
Total fixed maturities
10.7

 
20.8

 
44.2

 
76.7

Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
2.9

 
4.5

 
48.7

 
8.8

Common equities
5.5

 
14.1

 
22.7

 
38.0

Short-term investments
0

 
0.1

 
0

 
0.1

  Subtotal net realized gains (losses) on security sales
19.1

 
39.5

 
115.6

 
123.6

Other-than-temporary impairment losses
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
Commercial mortgage-backed securities
(0.4
)
 
0

 
(0.4
)
 
0

Redeemable preferred stocks
0

 
(25.4
)
 
0

 
(25.4
)
Total fixed maturities
(0.4
)
 
(25.4
)
 
(0.4
)
 
(25.4
)
Equity securities:
 
 
 
 
 
 
 
Common equities
(8.9
)
 
(1.4
)
 
(12.5
)
 
(1.6
)
Subtotal investment other-than-temporary impairment losses
(9.3
)
 
(26.8
)
 
(12.9
)
 
(27.0
)
Other asset impairment
(33.7
)
 
(34.8
)
 
(44.9
)
 
(34.8
)
  Subtotal other-than-temporary impairment losses
(43.0
)
 
(61.6
)
 
(57.8
)
 
(61.8
)
Other gains (losses)
 
 
 
 
 
 
 
Hybrid securities
(0.9
)
 
0.6

 
0.3

 
2.9

Derivative instruments
0

 
0.7

 
0

 
(35.8
)
Litigation settlements
0.1

 
0.1

 
1.2

 
0.1

    Subtotal other gains (losses)
(0.8
)
 
1.4

 
1.5

 
(32.8
)
     Total net realized gains (losses) on securities
$
(24.7
)
 
$
(20.7
)
 
$
59.3

 
$
29.0
Components of Net Investment Income
The components of net investment income for the three and nine months ended September 30, were: 
 
Three Months
 
Nine Months
(millions)
2017

2016

 
2017

2016

Fixed maturities:
 
 
 
 
 
U.S. government obligations
$
18.4

$
3.3

 
$
48.1

$
12.4

State and local government obligations
12.9

12.6

 
39.3

39.3

Foreign government obligations
0.1

0.1

 
0.3

0.3

Corporate debt securities
32.2

27.3

 
93.1

81.9

Residential mortgage-backed securities
7.8

11.1

 
27.3

34.9

Agency residential pass-through obligations
0.2

0.3

 
0.6

0.9

Commercial mortgage-backed securities
20.0

22.4

 
57.1

62.6

Other asset-backed securities
12.1

6.8

 
33.8

18.7

Redeemable preferred stocks
2.8

3.8

 
9.1

11.5

Total fixed maturities
106.5

87.7

 
308.7

262.5

Equity securities:
 
 
 
 
 
Nonredeemable preferred stocks
10.9

12.4

 
33.0

36.8

Common equities
14.9

13.9

 
42.8

42.0

Short-term investments
10.6

5.3

 
26.4

11.4

Investment income
142.9

119.3

 
410.9

352.7

Investment expenses
(5.8
)
(4.8
)
 
(18.0
)
(14.9
)
Net investment income
$
137.1

$
114.5

 
$
392.9

$
337.8
Schedule of Derivative Instruments [Table Text Block]
The following table shows the status of our derivative instruments at September 30, 2017 and 2016, and December 31, 2016, and for the three and nine months ended September 30, 2017 and 2016:
 
(millions)
 
 
 
 
Balance Sheet2
 
Comprehensive Income Statement
 
 
 
 
 
 
 
Assets (Liabilities)
Fair Value
 
Pretax Net Realized
Gains (Losses)
 
Notional Value1
 
 
 
 
 
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
Dec. 31,
 
 
 
 
 
September 30,
 
Dec. 31,
 
September 30,
 
September 30,
Derivatives designated as:
2017

 
2016

 
2016

 
Purpose
 
Classification
 
2017

 
2016

 
2016

 
2017

 
2016

 
2017

 
2016

Hedging instrument
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Closed:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ineffective cash flow hedge
$
31

 
$
370

 
$
370

 
Manage 
interest 
rate risk
 
NA
 
$
0

 
$
0

 
$
0

 
$
0

 
$
(1.4
)
 
$
0

 
$
(1.3
)
Non-hedging instruments
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
0

 
315

 
0

 
Manage 
portfolio
duration
 
Other liabilities
 
0

 
(13.0
)
 
0

 
0

 
1.7

 
0

 
(17.8
)
Closed:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
0

 
435

 
750

 
Manage 
portfolio
duration
 
NA
 
0

 
0

 
0

 
0

 
0.3

 
0

 
(17.0
)
U.S. Treasury Note futures
0

 
135

 
135

 
Manage 
portfolio
duration
 
NA
 
0

 
0

 
0

 
0

 
0.1

 
0

 
0.3

Total
NA

 
NA

 
NA

 
 
 
 
 
$
0

 
$
(13.0
)
 
$
0

 
$
0

 
$
0.7

 
$
0

 
$
(35.8
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
NA= Not applicable
1The amounts represent the value held at quarter and year end for open positions and the maximum amount held during the period for closed positions.
2To the extent we hold both derivative assets and liabilities with the same counterparty that are subject to an enforceable master netting arrangement, we reported them on a gross basis on our balance sheets, consistent with our historical presentation.