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Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Investments [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI
The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and other-than-temporary impairment (“OTTI”) included within AOCI of the Company’s fixed maturity securities as of the dates indicated:  
 
September 30, 2019
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
AOCI (1)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
U.S. government and government agencies and authorities
$
187.7

 
$
6.4

 
$
(0.1
)
 
$
194.0

 
$
—

States, municipalities and political subdivisions
234.8

 
29.6

 
—

 
264.4

 
—

Foreign governments
873.5

 
108.8

 
(0.1
)
 
982.2

 
—

Asset-backed
481.9

 
3.0

 
(2.6
)
 
482.3

 
—

Commercial mortgage-backed
226.8

 
13.8

 
(0.6
)
 
240.0

 
—

Residential mortgage-backed
1,235.7

 
61.8

 
(1.0
)
 
1,296.5

 
3.6

U.S. corporate
5,757.9

 
829.9

 
(2.7
)
 
6,585.1

 
16.4

Foreign corporate
2,106.2

 
270.5

 
(0.4
)
 
2,376.3

 
—

Total fixed maturity securities
$
11,104.5

 
$
1,323.8

 
$
(7.5
)
 
$
12,420.8

 
$
20.0

 
 
December 31, 2018
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
AOCI (1)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
U.S. government and government agencies and authorities
$
381.4

 
$
4.4

 
$
(1.2
)
 
$
384.6

 
$
—

States, municipalities and political subdivisions
238.9

 
17.6

 
(0.3
)
 
256.2

 
—

Foreign governments
856.3

 
58.8

 
(3.0
)
 
912.1

 
—

Asset-backed
513.6

 
0.5

 
(9.6
)
 
504.5

 
—

Commercial mortgage-backed
79.1

 
2.2

 
(1.6
)
 
79.7

 
—

Residential mortgage-backed
1,399.1

 
21.5

 
(14.8
)
 
1,405.8

 
5.0

U.S. corporate
5,337.0

 
315.7

 
(59.7
)
 
5,593.0

 
14.1

Foreign corporate
2,028.6

 
110.7

 
(18.1
)
 
2,121.2

 
—

Total fixed maturity securities
$
10,834.0

 
$
531.4

 
$
(108.3
)
 
$
11,257.1

 
$
19.1

 
(1)
Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity
The cost or amortized cost and fair value of fixed maturity securities as of September 30, 2019 by contractual maturity are shown below. Actual maturities may differ from contractual maturities because issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties.
 
Cost or
Amortized Cost
 
Fair Value
Due in one year or less
$
355.0

 
$
357.0

Due after one year through five years
2,511.3

 
2,603.8

Due after five years through ten years
2,442.4

 
2,663.1

Due after ten years
3,851.4

 
4,778.1

Total
9,160.1

 
10,402.0

Asset-backed
481.9

 
482.3

Commercial mortgage-backed
226.8

 
240.0

Residential mortgage-backed
1,235.7

 
1,296.5

Total
$
11,104.5

 
$
12,420.8
Net Realized Gains (Losses), Including Other-Than-Temporary Impairments
The following table sets forth the net realized gains (losses), including OTTI, recognized in the statement of operations for the periods indicated: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Net realized gains (losses) related to sales and other:
 
 
 
 
 
 
 
Fixed maturity securities
$
7.4

 
$
(7.7
)
 
$
15.1

 
$
(17.9
)
Equity securities (1)
9.4

 
2.3

 
46.3

 
(1.4
)
Other investments
0.3

 
—

 
5.4

 
2.5

Consolidated investment entities (2)
(2.0
)
 
0.2

 
(4.2
)
 
0.7

Total net realized gains (losses) related to sales and other
15.1

 
(5.2
)
 
62.6

 
(16.1
)
Net realized losses related to other-than-temporary impairments:
 
 
 
 
 
 
 
Fixed maturity securities
(0.2
)
 
—

 
(1.1
)
 
—

Other investments
—

 
(0.5
)
 
—

 
(0.5
)
Total net realized losses related to other-than-temporary impairments
(0.2
)
 
(0.5
)
 
(1.1
)
 
(0.5
)
Total net realized gains (losses)
$
14.9

 
$
(5.7
)
 
$
61.5

 
$
(16.6
)

(1)
Nine months ended September 30, 2019 and 2018 includes $10.4 million and $10.8 million, respectively, of gains on equity investment holdings accounted for under the measurement alternative. Three months ended September 30, 2018 includes $3.0 million of gains on equity investment holdings accounted for under the measurement alternative. There were no changes in fair value recorded on equity investments holdings accounted for under the measurement alternative for the three months ended September 30, 2019.
(2)
Consists of net realized gains (losses) from the change in fair value of the Company’s direct investment in collateralized loan obligations (“CLOs”). Refer to Note 9 for additional information.
Unrealized Gains on Equity Securities
The following table sets forth the portion of unrealized gains (losses) related to equity securities during the three and nine months ended September 30, 2019 and 2018:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Net gains (losses) recognized on equity securities
$
9.4

 
$
2.3

 
$
46.3

 
$
(1.4
)
Less: Net realized gains (losses) related to sales of equity securities
0.9

 
0.2

 
—

 
3.9

Total net unrealized gains (losses) on equity securities held
$
8.5

 
$
2.1

 
$
46.3

 
$
(5.3
)
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]
The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of September 30, 2019 and December 31, 2018 were as follows:
 
September 30, 2019
 
Less than 12 months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and government agencies and authorities
$
—

 
$
—

 
$
38.5

 
$
(0.1
)
 
$
38.5

 
$
(0.1
)
Foreign governments
11.5

 
(0.1
)
 
—

 
—

 
11.5

 
(0.1
)
Asset-backed
93.8

 
(1.4
)
 
71.1

 
(1.2
)
 
164.9

 
(2.6
)
Commercial mortgage-backed
1.7

 
(0.1
)
 
4.7

 
(0.5
)
 
6.4

 
(0.6
)
Residential mortgage-backed
66.7

 
(0.2
)
 
94.3

 
(0.8
)
 
161.0

 
(1.0
)
U.S. corporate
110.0

 
(2.0
)
 
9.1

 
(0.7
)
 
119.1

 
(2.7
)
Foreign corporate
18.6

 
(0.2
)
 
7.3

 
(0.2
)
 
25.9

 
(0.4
)
Total fixed maturity securities
$
302.3

 
$
(4.0
)
 
$
225.0

 
$
(3.5
)
 
$
527.3

 
$
(7.5
)
 

 
December 31, 2018
 
Less than 12 months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and government agencies and authorities
$
11.2

 
$
(0.1
)
 
$
89.5

 
$
(1.1
)
 
$
100.7

 
$
(1.2
)
States, municipalities and political subdivisions
31.5

 
(0.1
)
 
3.1

 
(0.2
)
 
34.6

 
(0.3
)
Foreign governments
136.4

 
(2.8
)
 
9.2

 
(0.2
)
 
145.6

 
(3.0
)
Asset-backed
370.6

 
(9.6
)
 
—

 
—

 
370.6

 
(9.6
)
Commercial mortgage-backed
29.4

 
(0.7
)
 
12.4

 
(0.9
)
 
41.8

 
(1.6
)
Residential mortgage-backed
378.2

 
(3.7
)
 
309.6

 
(11.1
)
 
687.8

 
(14.8
)
U.S. corporate
1,860.4

 
(49.5
)
 
173.1

 
(10.2
)
 
2,033.5

 
(59.7
)
Foreign corporate
706.6

 
(12.9
)
 
149.5

 
(5.2
)
 
856.1

 
(18.1
)
Total fixed maturity securities
$
3,524.3

 
$
(79.4
)
 
$
746.4

 
$
(28.9
)
 
$
4,270.7

 
$
(108.3
)