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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI The investment category and duration of the Company’s gross unrealized losses on fixed maturity securities as of June 30, 2018 and December 31, 2017 were as follows:
 
June 30, 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
$
112.7

 
$
(1.5
)
 
$
35.9

 
$
(0.6
)
 
$
148.6

 
$
(2.1
)
States, municipalities and political
  subdivisions
150.8

 
(0.9
)
 
3.3

 
(0.2
)
 
154.1

 
(1.1
)
Foreign governments
296.8

 
(1.4
)
 
6.5

 
(0.2
)
 
303.3

 
(1.6
)
Asset-backed
225.4

 
(0.7
)
 
—

 
—

 
225.4

 
(0.7
)
Commercial mortgage-backed
181.1

 
(1.7
)
 
12.0

 
(1.1
)
 
193.1

 
(2.8
)
Residential mortgage-backed
677.9

 
(12.6
)
 
161.1

 
(8.8
)
 
839.0

 
(21.4
)
U.S. corporate
2,037.9

 
(40.9
)
 
49.5

 
(2.8
)
 
2,087.4

 
(43.7
)
Foreign corporate
760.7

 
(10.1
)
 
63.6

 
(1.8
)
 
824.3

 
(11.9
)
Total fixed maturity securities
$
4,443.3

 
$
(69.8
)
 
$
331.9

 
$
(15.5
)
 
$
4,775.2

 
$
(85.3
)
 
 
December 31, 2017
 
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
$
104.2

 
$
(0.7
)
 
$
43.3

 
$
(0.5
)
 
$
147.5

 
$
(1.2
)
States, municipalities and political
  subdivisions
—

 
—

 
2.4

 
(0.1
)
 
2.4

 
(0.1
)
Foreign governments
24.4

 
(0.2
)
 
0.8

 
(0.1
)
 
25.2

 
(0.3
)
Asset-backed
27.6

 
(0.1
)
 
—

 
—

 
27.6

 
(0.1
)
Commercial mortgage-backed
—

 
—

 
12.4

 
(0.7
)
 
12.4

 
(0.7
)
Residential mortgage-backed
217.3

 
(2.4
)
 
162.9

 
(4.9
)
 
380.2

 
(7.3
)
U.S. corporate
562.8

 
(4.5
)
 
30.0

 
(0.5
)
 
592.8

 
(5.0
)
Foreign corporate
266.7

 
(3.5
)
 
19.0

 
(0.5
)
 
285.7

 
(4.0
)
Total fixed maturity securities
$
1,203.0

 
$
(11.4
)
 
$
270.8

 
$
(7.3
)
 
$
1,473.8

 
$
(18.7
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Non-redeemable preferred stock
$
13.8

 
$
(0.2
)
 
$
8.7

 
$
(0.3
)
 
$
22.5

 
$
(0.5
)
The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and other-than-temporary impairment (“OTTI”) included within accumulated other comprehensive income of the Company's fixed maturity securities as of the dates indicated: 
 
June 30, 2018
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
AOCI
(a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
U.S. government and government
  agencies and authorities
$
184.1

 
$
2.6

 
$
(2.1
)
 
$
184.6

 
$
—

States, municipalities and political
  subdivisions
461.6

 
17.9

 
(1.1
)
 
478.4

 
—

Foreign governments
858.4

 
62.8

 
(1.6
)
 
919.6

 
—

Asset-backed
494.7

 
1.2

 
(0.7
)
 
495.2

 
—

Commercial mortgage-backed
256.4

 
0.3

 
(2.8
)
 
253.9

 
—

Residential mortgage-backed
1,241.4

 
16.8

 
(21.4
)
 
1,236.8

 
5.6

U.S. corporate
5,198.1

 
365.8

 
(43.7
)
 
5,520.2

 
15.8

Foreign corporate
2,082.3

 
138.4

 
(11.9
)
 
2,208.8

 
—

Total fixed maturity securities
$
10,777.0

 
$
605.8

 
$
(85.3
)
 
$
11,297.5

 
$
21.4

 
 
December 31, 2017
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
AOCI
(a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
U.S. government and government
  agencies and authorities
$
180.6

 
$
3.2

 
$
(1.2
)
 
$
182.6

 
$
—

States, municipalities and political
  subdivisions
302.3

 
24.0

 
(0.1
)
 
326.2

 
—

Foreign governments
524.8

 
72.3

 
(0.3
)
 
596.8

 
—

Asset-backed
188.4

 
1.9

 
(0.1
)
 
190.2

 
1.0

Commercial mortgage-backed
38.6

 
0.2

 
(0.7
)
 
38.1

 
—

Residential mortgage-backed
1,084.2

 
32.5

 
(7.3
)
 
1,109.4

 
9.2

U.S. corporate
4,774.2

 
602.1

 
(5.0
)
 
5,371.3

 
17.4

Foreign corporate
1,663.4

 
188.6

 
(4.0
)
 
1,848.0

 
—

Total fixed maturity securities
$
8,756.5

 
$
924.8

 
$
(18.7
)
 
$
9,662.6

 
$
27.6

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
9.3

 
$
8.4

 
$
—

 
$
17.7

 
$
—

Non-redeemable preferred stocks
307.0

 
43.8

 
(0.5
)
 
350.3

 
—

Total equity securities
$
316.3

 
$
52.2

 
$
(0.5
)
 
$
368.0

 
$
—

 
(a)
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 June 30, 2018 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
$
320.5

 
$
322.1

Due after one year through five years
2,276.5

 
2,294.7

Due after five years through ten years
2,314.2

 
2,338.8

Due after ten years
3,873.3

 
4,356.0

Total
8,784.5

 
9,311.6

Asset-backed
494.7

 
495.2

Commercial mortgage-backed
256.4

 
253.9

Residential mortgage-backed
1,241.4

 
1,236.8

Total
$
10,777.0

 
$
11,297.5
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: 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Net realized gains (losses) on investments:
 
 
 
 
 
 
 
Fixed maturity securities
$
(7.6
)
 
$
11.9

 
$
(10.2
)
 
$
14.5

Equity securities (1)
(5.9
)
 
1.5

 
(3.7
)
 
3.8

Other investments
1.2

 
(0.1
)
 
2.5

 
(1.2
)
Consolidated investment entities (2)
0.9

 
—

 
0.5

 
—

Total net realized gains (losses) on investments
(11.4
)
 
13.3

 
(10.9
)
 
17.1

Net realized losses related to other-than-temporary
  impairments:
 
 
 
 
 
 
 
Fixed maturity securities
—

 
—

 
—

 
(0.4
)
Other investments
—

 
(0.1
)
 
—

 
(0.1
)
Total net realized losses related to other-than-
  temporary impairments
—

 
(0.1
)
 
—

 
(0.5
)
Total net realized gains (losses)
$
(11.4
)
 
$
13.2

 
$
(10.9
)
 
$
16.6


(1)
Six months ended June 30, 2018 includes a $7.8 million gain on one equity investment holding accounted for under the measurement alternative based on an observable market event where the implied value increased based on a new investment. Equity investments accounted for under the measurement alternative are included within Other investments on the consolidated balance sheet.
(2)
Consists of net realized losses from the change in fair value of the Company's direct investment in collateralized loan obligations ("CLOs"). Refer to Note 8 - Variable Interest Entities for further detail.
Unrealized Gains on Equity Securities The following table sets forth the portion of unrealized gains related to equity securities during the three and six months ended June 30, 2018:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2018
Net losses recognized on equity securities
$
(5.9
)
 
$
(3.7
)
Less: Net realized gains related to sales of equity securities
2.3

 
3.7

Total unrealized losses on equity securities held (1)
$
(8.2
)
 
$
(7.4
)
(1)
Net gains for 2018 are required to be reported through the income statement in accordance with the 2018 accounting guidance on financial instruments. Net unrealized gains of $9.0 million and $17.4 million in the three and six months ended June 30, 2017, respectively, were reported through AOCI.