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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI of Fixed Maturity and Equity Securities
The following tables show the cost or amortized cost, gross unrealized gains and losses, fair value and OTTI of the Company's fixed maturity and equity securities as of the dates indicated:
 
December 31, 2017
 
Cost or
 Amortized
 Cost
 
Gross
 Unrealized
 Gains
 
Gross
 Unrealized
Losses
 
Fair Value
 
OTTI in
 AOCI (a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
United States Government and government
agencies and authorities
$
3.1

 
$
0.1

 
$
—

 
$
3.2

 
$
—

States, municipalities and political
subdivisions
4.7

 
0.9

 
—

 
5.6

 
—

Foreign governments
8.4

 
2.1

 
—

 
10.5

 
—

Asset-backed
28.7

 
0.3

 
—

 
29.0

 
—

Commercial mortgage-backed
3.5

 
—

 
(0.2
)
 
3.3

 
—

Residential mortgage-backed
39.6

 
2.5

 
(0.4
)
 
41.7

 
1.6

U.S. corporate
588.6

 
153.6

 
(0.1
)
 
742.1

 
12.5

Foreign corporate
126.3

 
31.6

 
—

 
157.9

 
—

Total fixed maturity securities
$
802.9

 
$
191.1

 
$
(0.7
)
 
$
993.3

 
$
14.1

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
0.1

 
$
0.5

 
$
—

 
$
0.6

 
$
—

Non-redeemable preferred stocks
73.9

 
12.0

 
(0.1
)
 
85.8

 
—

Total equity securities
$
74.0

 
$
12.5

 
$
(0.1
)
 
$
86.4

 
$
—

 
December 31, 2016
 
Cost or
 Amortized
 Cost
 
Gross
 Unrealized
 Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
OTTI in
 AOCI (a)
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
United States Government and government
agencies and authorities
$
1.9

 
$
0.1

 
$
—

 
$
2.0

 
$
—

States, municipalities and political
subdivisions
9.9

 
0.9

 
—

 
10.8

 
—

Foreign governments
9.3

 
2.0

 
—

 
11.3

 
—

Asset-backed
0.2

 
—

 
—

 
0.2

 
—

Commercial mortgage-backed
3.4

 
—

 
(0.2
)
 
3.2

 
—

Residential mortgage-backed
33.7

 
3.3

 
(0.1
)
 
36.9

 
2.0

U.S. corporate
667.0

 
127.7

 
(1.3
)
 
793.4

 
11.2

Foreign corporate
146.1

 
24.9

 
(0.1
)
 
170.9

 
—

Total fixed maturity securities
$
871.5

 
$
158.9

 
$
(1.7
)
 
$
1,028.7

 
$
13.2

Equity securities:
 
 
 
 
 
 
 
 
 
Common stocks
$
0.1

 
$
0.3

 
$
—

 
$
0.4

 
$
—

Non-redeemable preferred stocks
85.6

 
7.8

 
(0.2
)
 
93.2

 
—

Total equity securities
$
85.7

 
$
8.1

 
$
(0.2
)
 
$
93.6

 
$
—

(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.
Schedule of Cost or Amortized Cost and Fair Value of Fixed Maturity Securities By Contractual Maturity
The cost or amortized cost and fair value of fixed maturity securities at December 31, 2017 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
$
7.3

 
$
7.4

Due after one year through five years
73.9

 
79.5

Due after five years through ten years
93.4

 
106.6

Due after ten years
556.5

 
725.8

Total
731.1

 
919.3

Asset-backed
28.7

 
29.0

Commercial mortgage-backed
3.5

 
3.3

Residential mortgage-backed
39.6

 
41.7

Total
$
802.9

 
$
993.3
Schedule of Major Categories of Net Investment Income
Major categories of net investment income were as follows:
 
Years Ended December 31,
 
2017
 
2016
 
2015
Fixed maturity securities
$
52.4

 
$
74.1

 
$
130.0

Equity securities
5.4

 
7.0

 
9.2

Commercial mortgage loans on real estate
5.6

 
10.2

 
30.4

Policy loans
0.4

 
0.5

 
0.5

Other investments
2.5

 
7.7

 
5.3

Cash and cash equivalents
—

 
0.3

 
—

Total investment income
66.3

 
99.8

 
175.4

Investment expenses
(2.1
)
 
(2.0
)
 
(5.9
)
Net investment income
$
64.2

 
$
97.8

 
$
169.5
Summary of Proceeds From Sales of Available-For-Sale Securities and the Gross Realized Gains and Gross Realized Losses
The following table summarizes the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been recognized in the statement of operations as a result of those sales.
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Proceeds from sales
$
218.7

 
$
1,939.4

 
$
312.0

Gross realized gains (a)
7.1

 
168.9

 
9.7

Gross realized losses (b)
(0.4
)
 
(19.9
)
 
(4.3
)

(a) Year ended December 31, 2016 gross realized gains includes $145.6 million related to the sale of Assurant Employee Benefits as described in Note 1.
(b) Year ended December 31, 2016 gross realized losses includes $15.9 million related to the sale of Assurant Employee Benefits as described in Note 1.
Schedule of Net Realized Gains (Losses), Including Other-Than-Temporary Impairments
The following table sets forth the net realized gains (losses), including other-than-temporary impairments, recognized in the statement of operations as follows:
 
Years Ended December 31,
 
2017
 
2016
 
2015
Net realized gains (losses) related to sales and other:
 
 
 
 
 
Fixed maturity securities
$
6.1

 
$
143.6

 
$
3.1

Equity securities
0.2

 
5.7

 
1.8

Commercial mortgage loans on real estate
1.3

 
13.6

 
0.4

Other investments
2.2

 
2.2

 
11.7

Total net realized gains related to sales and other (a)
9.8

 
165.1

 
17.0

Net realized losses related to other-than-temporary impairments:
 
 
 
 
 
Fixed maturity securities
(0.1
)
 
(0.3
)
 
(2.4
)
Other investments
—

 
(1.9
)
 
(4.6
)
Total net realized losses related to other-than-temporary impairments
(0.1
)
 
(2.2
)
 
(7.0
)
Total net realized gains
$
9.7

 
$
162.9

 
$
10.0


(a) The year ended December 31, 2016 net realized gains includes $141.5 million related to the sale of Assurant Employee Benefits as described in Note 1.
Schedule of Credit Loss Impairments on Fixed Maturity Securities for Which a Portion of the OTTI Loss was Recognized in AOCI
The following table sets forth the amount of credit loss impairments recognized within the results of operations on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts.
 
Years Ended December 31,
 
2017
 
2016
 
2015
Balance, beginning of year
$
11.1

 
$
13.6

 
$
13.5

Additions for credit loss impairments recognized in the current period on
 securities previously impaired
—

 
0.3

 
—

Additions for credit loss impairments recognized in the current period on
 securities not previously impaired
—

 
—

 
0.7

Reductions for increases in cash flows expected to be collected that are
 recognized over the remaining life of the security
(0.3
)
 
(0.5
)
 
(0.2
)
Reductions for credit loss impairments previously recognized on securities
 which matured, paid down, prepaid or were sold during the period
(0.1
)
 
(2.3
)
 
(0.4
)
Balance, end of year
$
10.7

 
$
11.1

 
$
13.6
Schedule of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities
The investment category and duration of the Company's gross unrealized losses on fixed maturity securities and equity securities at December 31, 2017 and 2016 were as follows:
 
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:
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed
$
—

 
$
—

 
$
3.3

 
$
(0.2
)
 
$
3.3

 
$
(0.2
)
Residential mortgage-backed
9.5

 
(0.4
)
 
—

 
—

 
9.5

 
(0.4
)
U.S. corporate
—

 
—

 
1.5

 
(0.1
)
 
1.5

 
(0.1
)
Total fixed maturity securities
$
9.5

 
$
(0.4
)
 
$
4.8

 
$
(0.3
)
 
$
14.3

 
$
(0.7
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Non-redeemable preferred stocks
$
2.5

 
$
(0.1
)
 
$
—

 
$
—

 
$
2.5

 
$
(0.1
)
 
December 31, 2016
 
Less than 12 months
 
12 Months or More
 
Total
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
 
Fair
 Value
 
Unrealized
 Losses
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
Commercial mortgage-backed
$
3.2

 
$
(0.2
)
 
$
—

 
$
—

 
$
3.2

 
$
(0.2
)
Residential mortgage-backed
1.9

 
(0.1
)
 
—

 
—

 
$
1.9

 
(0.1
)
U.S. corporate
55.3

 
(1.1
)
 
1.2

 
(0.2
)
 
$
56.5

 
(1.3
)
Foreign corporate
—

 
—

 
2.0

 
(0.1
)
 
$
2.0

 
(0.1
)
Total fixed maturity securities
$
60.4


$
(1.4
)

$
3.2


$
(0.3
)

$
63.6


$
(1.7
)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
Non-redeemable preferred stocks
$
13.4

 
$
(0.2
)
 
$
—

 
$
—

 
$
13.4

 
$
(0.2
)
Schedule of Cost or Amortized Cost and Fair Value of Securities in an Unrealized Loss Position
The cost or amortized cost and fair value of available-for-sale fixed maturity securities in an unrealized loss position at December 31, 2017, by contractual maturity, is shown below:
 
Cost or
Amortized Cost
 
Fair Value
Due in one year through five years
1.6

 
1.5

Commercial mortgage-backed
3.5

 
3.3

Residential mortgage-backed
9.9

 
9.5

Total
$
15.0

 
$
14.3
Summary of Loan-To-Value and Average Debt-Service Coverage Ratios
The following summarizes our loan-to-value and average debt-service coverage ratios as of the dates indicated:
 
 
December 31, 2017
Loan-to-Value
 
Carrying
Value
 
% of
 Gross
Mortgage
Loans
 
Debt-
Service
Coverage
 Ratio
70% and less
 
$
79.1

 
100.0
%
 
2.11

Less valuation allowance
 
(0.4
)
 
 

 
 

Net commercial mortgage loans on real estate
 
$
78.7

 
 

 
 

 
 
December 31, 2016
Loan-to-Value
 
Carrying
Value
 
% of
 Gross
Mortgage
Loans
 
Debt-
Service
Coverage
 Ratio
70% and less
 
$
92.3

 
92.2
%
 
1.80

81 - 95%
 
3.0

 
3.0
%
 
1.11

Greater than 95%
 
4.8

 
4.8
%
 
3.86

Gross commercial mortgage loans on real estate
 
100.1

 
100.0
%
 
1.88

Less valuation allowance
 
(1.7
)
 
 

 
 

Net commercial mortgage loans on real estate
 
$
98.4