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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments Schedule [Abstract]  
Schedule of Debt and Equity 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. Our securities are reported in our Consolidated Balance Sheets at fair value, with all of our equity securities having a readily determinable fair value. The changes in fair value for our fixed-maturity securities (other than hybrid securities) are reported as a component of accumulated other comprehensive income, net of deferred income taxes, in our Consolidated Balance Sheets.
The net holding period gains (losses) reported below represent the inception-to-date changes in fair value. The changes in the net holding period gains (losses) between periods for the hybrid securities and, beginning in 2018, equity securities are recorded as a component of net realized gains (losses) on securities in our Consolidated Statements of Comprehensive Income. Prior to 2018, the change in fair value of our equity securities was part of accumulated other comprehensive income (see Note 14 – New Accounting Standards for further discussion).

($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
8,005.8

 
$
0.9

 
$
(141.3
)
 
$
0

 
$
7,865.4

 
25.4
%
State and local government obligations
1,678.9

 
4.3

 
(15.9
)
 
0

 
1,667.3

 
5.4

Foreign government obligations
0

 
0

 
0

 
0

 
0

 
0

Corporate debt securities
7,422.4

 
4.2

 
(94.3
)
 
(2.0
)
 
7,330.3

 
23.7

Residential mortgage-backed securities
819.6

 
8.4

 
(5.4
)
 
0

 
822.6

 
2.7

Commercial mortgage-backed securities
2,725.5

 
2.9

 
(31.5
)
 
0

 
2,696.9

 
8.7

Other asset-backed securities
3,189.2

 
2.0

 
(13.7
)
 
0.1

 
3,177.6

 
10.3

Redeemable preferred stocks
220.4

 
14.1

 
(2.0
)
 
(3.4
)
 
229.1

 
0.7

Total fixed maturities
24,061.8

 
36.8

 
(304.1
)
 
(5.3
)
 
23,789.2

 
76.9

Short-term investments
3,231.2

 
0

 
0

 
0

 
3,231.2

 
10.5

       Total available-for-sale securities
27,293.0

 
36.8

 
(304.1
)
 
(5.3
)
 
27,020.4

 
87.4

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
677.0

 
0

 
0

 
81.6

 
758.6

 
2.4

Common equities
1,314.0

 
0

 
0

 
1,828.2

 
3,142.2

 
10.2

       Total equity securities
1,991.0

 
0

 
0

 
1,909.8

 
3,900.8

 
12.6

  Total portfolio1,2
$
29,284.0

 
$
36.8

 
$
(304.1
)
 
$
1,904.5

 
$
30,921.2

 
100.0
%

($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
4,166.4

 
$
4.4

 
$
(15.8
)
 
$
0

 
$
4,155.0

 
16.0
%
State and local government obligations
2,473.3

 
32.5

 
(5.9
)
 
0.2

 
2,500.1

 
9.7

Foreign government obligations
22.5

 
0

 
0

 
0

 
22.5

 
0.1

Corporate debt securities
4,991.6

 
29.4

 
(7.6
)
 
0.4

 
5,013.8

 
19.3

Residential mortgage-backed securities
1,260.3

 
10.9

 
(5.9
)
 
2.3

 
1,267.6

 
4.8

Commercial mortgage-backed securities
2,364.9

 
19.8

 
(9.7
)
 
0

 
2,375.0

 
9.1

Other asset-backed securities
2,843.3

 
6.4

 
(2.5
)
 
0.2

 
2,847.4

 
11.0

Redeemable preferred stocks
189.4

 
19.0

 
(1.7
)
 
0

 
206.7

 
0.8

Total fixed maturities
18,311.7

 
122.4

 
(49.1
)
 
3.1

 
18,388.1

 
70.8

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
666.0

 
123.6

 
(6.5
)
 
0

 
783.1

 
3.0

Common equities
1,472.3

 
1,611.7

 
(6.5
)
 
0

 
3,077.5

 
11.8

Short-term investments
3,729.7

 
0

 
0

 
0

 
3,729.7

 
14.4

Total portfolio1,2
$
24,179.7

 
$
1,857.7

 
$
(62.1
)
 
$
3.1

 
$
25,978.4

 
100.0
%
 
($ in millions)
Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized
Losses

 
Net
Holding Period Gains
(Losses)

 
Fair
Value

 
% of
Total
Fair
Value

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
6,688.8

 
$
1.1

 
$
(44.0
)
 
$
0

 
$
6,645.9

 
24.4
%
State and local government obligations
2,285.6

 
20.7

 
(9.3
)
 
0.1

 
2,297.1

 
8.4

Foreign government obligations
0

 
0

 
0

 
0

 
0

 
0

Corporate debt securities
4,997.2

 
14.8

 
(14.4
)
 
0.1

 
4,997.7

 
18.3

Residential mortgage-backed securities
828.8

 
11.3

 
(3.4
)
 
0

 
836.7

 
3.1

Commercial mortgage-backed securities
2,760.1

 
11.8

 
(13.3
)
 
0

 
2,758.6

 
10.1

Other asset-backed securities
2,454.5

 
4.5

 
(4.5
)
 
0.2

 
2,454.7

 
9.0

Redeemable preferred stocks
194.9

 
17.8

 
(1.5
)
 
(0.2
)
 
211.0

 
0.8

Total fixed maturities
20,209.9

 
82.0

 
(90.4
)
 
0.2

 
20,201.7

 
74.1

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
698.6

 
114.0

 
(8.8
)
 
0

 
803.8

 
2.9

Common equities
1,499.0

 
1,901.0

 
(0.2
)
 
0

 
3,399.8

 
12.5

Short-term investments
2,869.4

 
0

 
0

 
0

 
2,869.4

 
10.5

Total portfolio1,2
$
25,276.9

 
$
2,097.0

 
$
(99.4
)
 
$
0.2

 
$
27,274.7

 
100.0
%

1Our portfolio reflects the effect of unsettled security transactions; at June 30, 2018 and 2017, we had $362.1 million and $287.1 million, respectively, included in “other liabilities,” compared to $5.8 million included in “other assets” at December 31, 2017.
2The total fair value of the portfolio at June 30, 2018 and 2017, and December 31, 2017, included $1.7 billion, $1.1 billion, and $1.6 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 securities are hybrid securities, which are reported at fair value:

 
June 30,
 
 
(millions)
2018

 
2017

 
December 31, 2017

Fixed maturities:
 
 
 
 
 
State and local government obligations
$
3.6

 
$
6.6

 
$
6.1

Corporate debt securities
170.3

 
61.3

 
99.8

Residential mortgage-backed securities
0

 
189.7

 
0

Other asset-backed securities
5.5

 
7.7

 
6.7

Redeemable preferred stocks
67.3

 
0

 
30.3

Total hybrid securities
$
246.7

 
$
265.3

 
$
142.9
Investments Classified by Contractual Maturity Date [Table Text Block]
The composition of fixed maturities by maturity at June 30, 2018, was:
 
(millions)
Cost

 
Fair Value

Less than one year
$
3,805.2

 
$
3,809.2

One to five years
15,190.7

 
14,999.1

Five to ten years
4,939.7

 
4,855.4

Ten years or greater
126.2

 
125.5

Total
$
24,061.8

 
$
23,789.2

 
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

June 30, 2018
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
70

$
7,503.2

$
(141.3
)
33

$
4,543.5

$
(73.6
)
 
37

$
2,959.7

$
(67.7
)
State and local government obligations
355

1,050.9

(15.9
)
219

631.9

(7.1
)
 
136

419.0

(8.8
)
Corporate debt securities
391

6,153.5

(94.3
)
322

5,439.3

(77.2
)
 
69

714.2

(17.1
)
Residential mortgage-backed securities
227

380.3

(5.4
)
52

188.6

(0.9
)
 
175

191.7

(4.5
)
Commercial mortgage-backed securities
142

2,300.9

(31.5
)
85

1,371.4

(14.4
)
 
57

929.5

(17.1
)
Other asset-backed securities
219

2,479.7

(13.7
)
148

2,055.1

(8.5
)
 
71

424.6

(5.2
)
Redeemable preferred stocks
3

30.2

(2.0
)
1

4.6

(0.2
)
 
2

25.6

(1.8
)
Total fixed maturities
1,407

$
19,898.7

$
(304.1
)
860

$
14,234.4

$
(181.9
)
 
547

$
5,664.3

$
(122.2
)
 
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

June 30, 2017
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
41

$
2,781.8

$
(15.8
)
39

$
2,725.1

$
(15.1
)
 
2

$
56.7

$
(0.7
)
State and local government obligations
222

818.7

(5.9
)
138

479.8

(3.3
)
 
84

338.9

(2.6
)
Corporate debt securities
143

1,905.2

(7.6
)
122

1,599.6

(5.3
)
 
21

305.6

(2.3
)
Residential mortgage-backed securities
220

535.7

(5.9
)
126

197.8

(1.1
)
 
94

337.9

(4.8
)
Commercial mortgage-backed securities
74

905.6

(9.7
)
52

679.5

(5.7
)
 
22

226.1

(4.0
)
Other asset-backed securities
160

2,077.8

(2.5
)
145

1,823.8

(1.9
)
 
15

254.0

(0.6
)
Redeemable preferred stocks
1

10.8

(1.7
)
0

0

0

 
1

10.8

(1.7
)
Total fixed maturities
861

9,035.6

(49.1
)
622

7,505.6

(32.4
)
 
239

1,530.0

(16.7
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
3

73.1

(6.5
)
0

0

0

 
3

73.1

(6.5
)
Common equities
80

73.1

(6.5
)
74

72.3

(6.5
)
 
6

0.8

0

Total equity securities
83

146.2

(13.0
)
74

72.3

(6.5
)
 
9

73.9

(6.5
)
Total portfolio
944

$
9,181.8

$
(62.1
)
696

$
7,577.9

$
(38.9
)
 
248

$
1,603.9

$
(23.2
)
 
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

December 31, 2017
 
 
 
 
 
 
 
 
 
 
Fixed maturities:
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
58

$
5,817.0

$
(44.0
)
41

$
4,869.3

$
(34.6
)
 
17

$
947.7

$
(9.4
)
State and local government obligations
358

1,200.3

(9.3
)
230

737.6

(4.4
)
 
128

462.7

(4.9
)
Corporate debt securities
222

2,979.4

(14.4
)
171

2,072.9

(9.1
)
 
51

906.5

(5.3
)
Residential mortgage-backed securities
201

300.9

(3.4
)
30

75.1

(0.2
)
 
171

225.8

(3.2
)
Commercial mortgage-backed securities
105

1,682.3

(13.3
)
63

1,221.2

(5.9
)
 
42

461.1

(7.4
)
Other asset-backed securities
197

1,837.3

(4.5
)
134

1,377.8

(3.3
)
 
63

459.5

(1.2
)
Redeemable preferred stocks
2

21.8

(1.5
)
1

10.8

(0.1
)
 
1

11.0

(1.4
)
Total fixed maturities
1,143

13,839.0

(90.4
)
670

10,364.7

(57.6
)
 
473

3,474.3

(32.8
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
Nonredeemable preferred stocks
4

127.8

(8.8
)
1

56.5

(0.5
)
 
3

71.3

(8.3
)
Common equities
19

13.4

(0.2
)
18

13.4

(0.2
)
 
1

0

0

Total equity securities
23

141.2

(9.0
)
19

69.9

(0.7
)
 
4

71.3

(8.3
)
Total portfolio
1,166

$
13,980.2

$
(99.4
)
689

$
10,434.6

$
(58.3
)
 
477

$
3,545.6

$
(41.1
)
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):
 
 
June 30,
 
December 31,
2017

(millions)
2018

 
2017

 
Fixed maturities:
 
 
 
 
 
Residential mortgage-backed securities
$
(19.7
)
 
$
(19.7
)
 
$
(19.7
)
Commercial mortgage-backed securities
(0.3
)
 
(0.5
)
 
(0.3
)
Total fixed maturities
$
(20.0
)
 
$
(20.2
)
 
$
(20.0
)
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 June 30, 2018 and 2017, 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 June 30, 2018
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at March 31, 2018
$
0

 
$
0.5

 
$
0.5

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 June 30, 2018
$
0.3

 
$
0.5

 
$
0.8

 
 
 
 
 
 
 
Six Months Ended June 30, 2018
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at December 31, 2017
$
0

 
$
0.5

 
$
0.5

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 June 30, 2018
$
0.3

 
$
0.5

 
$
0.8

 
Three Months Ended June 30, 2017
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at March 31, 2017
$
11.4

 
$
0.1

 
$
11.5

Reductions for securities sold/matured
(11.4
)
 
0

 
(11.4
)
Change in recoveries of future cash flows expected to be collected1
0.2

 
0

 
0.2

Balance at June 30, 2017
$
0.2

 
$
0.1

 
$
0.3

 
 
 
 
 
 
 
Six Months Ended June 30, 2017
 
Mortgage-Backed
 
 
(millions)
Residential 

 
Commercial 

 
Total

Balance at December 31, 2016
$
11.1

 
$
0.4

 
$
11.5

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 June 30, 2017
$
0.2

 
$
0.1

 
$
0.3

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 six months ended June 30, were:
 
Three Months
 
Six Months
(millions)
2018

 
2017

 
2018

 
2017

Gross realized gains on security sales
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
U.S. government obligations
$
1.7

 
$
4.5

 
$
1.7

 
$
4.9

State and local government obligations
0.6

 
2.6

 
9.2

 
3.1

Corporate and other debt securities
0.3

 
7.3

 
0.4

 
11.4

Residential mortgage-backed securities
0

 
20.9

 
0

 
21.0

Commercial mortgage-backed securities
0.3

 
1.2

 
2.0

 
2.4

Other asset-backed securities
0.1

 
0

 
0.1

 
0.3

Redeemable preferred stocks
3.2

 
0

 
4.3

 
0.3

Total available-for-sale securities
6.2

 
36.5

 
17.7

 
43.4

Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
0

 
6.2

 
3.6

 
51.6

Common equities
18.5

 
9.9

 
138.4

 
17.3

Total equity securities
18.5

 
16.1

 
142.0

 
68.9

   Subtotal gross realized gains on security sales
24.7

 
52.6

 
159.7


112.3

Gross realized losses on security sales
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
U.S. government obligations
(29.9
)
 
(0.4
)
 
(38.8
)
 
(3.6
)
State and local government obligations
(0.6
)
 
0

 
(1.9
)
 
(0.1
)
Corporate and other debt securities
(1.0
)
 
(1.9
)
 
(4.1
)
 
(2.8
)
Residential mortgage-backed securities
0

 
(0.3
)
 
0

 
(0.3
)
Commercial mortgage-backed securities
0

 
(0.7
)
 
(6.3
)
 
(3.1
)
Other asset-backed securities
(0.9
)
 
0

 
(1.0
)
 
0

Total available-for-sale securities
(32.4
)
 
(3.3
)
 
(52.1
)
 
(9.9
)
Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
(1.9
)
 
(4.6
)
 
(2.3
)
 
(5.8
)
Common equities
0

 
0

 
(7.9
)
 
(0.1
)
Total equity securities
(1.9
)
 
(4.6
)
 
(10.2
)
 
(5.9
)
   Subtotal gross realized losses on security sales
(34.3
)
 
(7.9
)
 
(62.3
)
 
(15.8
)
Net realized gains (losses) on security sales
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
U.S. government obligations
(28.2
)
 
4.1

 
(37.1
)
 
1.3

State and local government obligations
0

 
2.6

 
7.3

 
3.0

Corporate and other debt securities
(0.7
)
 
5.4

 
(3.7
)
 
8.6

Residential mortgage-backed securities
0

 
20.6

 
0

 
20.7

Commercial mortgage-backed securities
0.3

 
0.5

 
(4.3
)
 
(0.7
)
Other asset-backed securities
(0.8
)
 
0

 
(0.9
)
 
0.3

Redeemable preferred stocks
3.2

 
0

 
4.3

 
0.3

Total available-for-sale securities
(26.2
)
 
33.2

 
(34.4
)
 
33.5

Equity securities:
 
 
 
 
 
 
 
Nonredeemable preferred stocks
(1.9
)
 
1.6

 
1.3

 
45.8

Common equities
18.5

 
9.9

 
130.5

 
17.2

Total equity securities
16.6

 
11.5

 
131.8

 
63.0

Litigation settlements and other gains (losses)
0

 
0.8

 
0

 
1.1

  Subtotal net realized gains (losses) on security sales
(9.6
)
 
45.5

 
97.4

 
97.6

Net holding period gains (losses)
 
 
 
 
 
 
 
Hybrid securities
(2.3
)
 
0.4

 
(5.5
)
 
1.2

Equity securities
55.8

 
0

 
(96.2
)
 
0

  Subtotal net holding period gains (losses)
53.5

 
0.4

 
(101.7
)
 
1.2

Other-than-temporary impairment losses
 
 
 
 
 
 
 
Equity securities:
 
 
 
 
 
 
 
Common equities
0

 
(2.6
)
 
0

 
(3.6
)
Subtotal investment other-than-temporary impairment losses
0

 
(2.6
)
 
0

 
(3.6
)
Other asset impairment
(11.1
)
 
(11.2
)
 
(11.1
)
 
(11.2
)
  Subtotal other-than-temporary impairment losses
(11.1
)
 
(13.8
)
 
(11.1
)
 
(14.8
)
     Total net realized gains (losses) on securities
$
32.8

 
$
32.1

 
$
(15.4
)
 
$
84.0
Components of Equity Realized Gains (Losses) [Table Text Block]
The following table reflects our holding period realized gains (losses) on equity securities recognized for the three and six months ended June 30, 2018 for equity securities held at quarter end:
 
Three Months

Six Months

(millions)
2018

2018

Total net gains (losses) recognized during the period on equity securities
$
72.4

$
35.6

Less: Net gains (losses) recognized on equity securities sold during the period
16.6

131.8

Net holding period gains (losses) recognized during the period on equity securities held at period end
$
55.8

$
(96.2
)
Note: Comparative disclosure for the prior year period is not meaningful.
Components of Net Investment Income
The components of net investment income for the three and six months ended June 30, were: 
 
Three Months
 
Six Months
(millions)
2018

2017

 
2018

2017

Available-for-sale securities:
 
 
 
 
 
   Fixed maturities:
 
 
 
 
 
U.S. government obligations
$
45.9

$
17.0

 
$
85.7

$
29.7

State and local government obligations
9.1

13.1

 
19.1

26.4

Foreign government obligations
0

0.1

 
0

0.2

Corporate debt securities
51.8

31.3

 
88.0

60.9

Residential mortgage-backed securities
6.6

10.3

 
13.5

19.9

Commercial mortgage-backed securities
20.2

18.3

 
41.4

37.1

Other asset-backed securities
16.1

11.8

 
29.7

21.7

Redeemable preferred stocks
2.9

2.9

 
5.5

6.3

Total fixed maturities
152.6

104.8

 
282.9

202.2

   Short-term investments
14.9

8.8

 
25.0

15.8

    Total available-for-sale securities
167.5

113.6

 
307.9

218.0

Equity securities:
 
 
 
 
 
Nonredeemable preferred stocks
10.4

10.6

 
21.3

22.1

Common equities
14.2

14.6

 
29.2

27.9

    Total equity securities
24.6

25.2

 
50.5

50.0

    Investment income
192.1

138.8

 
358.4

268.0

    Investment expenses
(6.2
)
(6.6
)
 
(12.2
)
(12.2
)
Net investment income
$
185.9

$
132.2

 
$
346.2

$
255.8