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Investments (Tables)
 12 Months Ended
Dec. 31, 2020
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, and fair value of the Company's fixed maturity securities as of the dates indicated:
 December 31, 2020
 Cost or
 Amortized
 Cost		Gross
 Unrealized
 Gains		Gross
 Unrealized
Losses		Fair Value
Fixed maturity securities:
U.S. government and government agencies and authorities$0.6 $0.1 $— $0.7 
States, municipalities and political subdivisions12.9 2.6 — 15.5 
Foreign governments18.4 6.1 (0.4)24.1 
Asset-backed99.0 1.5 (0.3)100.2 
Commercial mortgage-backed7.5 0.5 — 8.0 
Residential mortgage-backed27.2 2.9 — 30.1 
U.S. corporate462.8 189.5 (1.3)651.0 
Foreign corporate93.6 38.6 — 132.2 
Total fixed maturity securities$722.0 $241.8 $(2.0)$961.8 
 December 31, 2019
 Cost or
 Amortized
 Cost		Gross
 Unrealized
 Gains		Gross
Unrealized
Losses		Fair ValueOTTI in
 AOCI (1)
Fixed maturity securities:
U.S. government and government
agencies and authorities		$0.6 $0.1 $— $0.7 $— 
States, municipalities and political
subdivisions		13.0 1.9 — 14.9 — 
Foreign governments8.4 2.4 — 10.8 — 
Asset-backed102.1 0.7 (0.4)102.4 — 
Commercial mortgage-backed5.0 — — 5.0 — 
Residential mortgage-backed31.8 2.1 — 33.9 0.6 
U.S. corporate491.3 154.8 — 646.1 11.6 
Foreign corporate108.6 34.3 — 142.9 — 
Total fixed maturity securities$760.8 $196.3 $(0.4)$956.7 $12.2 
(1) Represents the amount of non-credit related impairment 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 prior to adoption of the expected credit loss standard. See Note 2 for more information.
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, 2020 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$7.0 $7.2 
Due after one year through five years29.7 34.1 
Due after five years through ten years120.4 156.2 
Due after ten years431.2 626.0 
Total588.3 823.5 
Asset-backed99.0 100.2 
Commercial mortgage-backed7.5 8.0 
Residential mortgage-backed27.2 30.1 
Total$722.0 $961.8 
Schedule of Major Categories of Net Investment Income
The following table shows the major categories of net investment income for the periods indicated:
 Years Ended December 31,
 202020192018
Fixed maturity securities$45.6 $47.5 $49.7 
Equity securities4.0 4.6 5.1 
Commercial mortgage loans on real estate2.4 2.9 3.8 
Policy loans0.3 0.3 0.4 
Other investments3.1 5.3 7.0 
Cash and cash equivalents— 0.1 0.1 
Total investment income55.4 60.7 66.1 
Investment expenses(1.8)(1.4)(1.5)
Net investment income$53.6 $59.3 $64.6 
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 fixed maturities and gross realized gains and gross realized losses that have been recognized in the statement of operations as a result of those sales for the periods indicated:
 For the Years Ended December 31,
Fixed maturity securities:202020192018
Proceeds from sales$16.3 $93.7 $177.7 
Gross realized gains$3.7 $3.5 $6.9 
Gross realized losses(1.3)(0.9)(2.6)
Net realized gains from sales of fixed maturity securities$2.4 $2.6 $4.3 
Schedule of Net Realized Gains (Losses), Including Other-Than-Temporary Impairments
The following table sets forth the net realized gains (losses) recognized in the statement of operations for the periods indicated:
 Years Ended December 31,
 202020192018
Net realized gains (losses) related to sales and other:
Fixed maturity securities$2.4 $2.6 $4.3 
Equity securities1.7 8.3 (6.1)
Commercial mortgage loans on real estate— — 0.4 
Other investments(2.6)(1.5)— 
Total net realized gains (losses) related to sales and other1.5 9.4 (1.4)
Schedule of Unrealized Gains on Equity Securities
The following table sets forth the portion of unrealized gains (losses) related to equity securities for the period indicated:
Years Ended December 31,
202020192018
Net gains (losses) recognized on equity securities$1.7 $8.3 $(6.1)
Less: Net realized gains related to sales of equity securities0.2 1.7 0.4 
Total net unrealized gains (losses) on equity securities$1.5 $6.6 $(6.5)
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, as of December 31, 2020 and 2019 were as follows:
 December 31, 2020
 Less than 12 months12 Months or MoreTotal
 Fair
 Value		Unrealized
 Losses		Fair
 Value		Unrealized
 Losses		Fair
 Value		Unrealized
 Losses
Fixed maturity securities:
Foreign governments$3.6 $(0.4)$— $— $3.6 $(0.4)
Asset-backed$7.1 $(0.1)$19.7 $(0.2)$26.8 $(0.3)
U.S. corporate10.9 (1.3)— — 10.9 (1.3)
Total fixed maturity securities$21.6 $(1.8)$19.7 $(0.2)$41.3 $(2.0)
 December 31, 2019
 Less than 12 months12 Months or MoreTotal
 Fair
 Value		Unrealized
 Losses		Fair
 Value		Unrealized
 Losses		Fair
 Value		Unrealized
 Losses
Fixed maturity securities:
Asset-backed$— $— $21.1 $(0.4)$21.1 $(0.4)
Total fixed maturity securities$— $— $21.1 $(0.4)$21.1 $(0.4)
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 as of December 31, 2020, by contractual maturity, is shown below:
December 31, 2020
 Cost or
Amortized Cost		Fair Value
Due after five years through ten years$4.3 $4.2 
Due after ten years11.9 10.3 
Total16.2 14.5 
Asset-backed27.1 $26.8 
Total$43.3 $41.3 
Summary of Loan-To-Value and Average Debt-Service Coverage Ratios
The following table presents the amortized cost basis of commercial mortgage loans, excluding allowance for credit losses, by origination year for certain key credit quality indicators at December 31, 2020:
 Origination Year
Loan-to-value ratios (1):20202019201820172016PriorTotal% of Total
70% and less
$— $— $6.3 $9.5 $6.0 $22.2 $44.0 100.0 %
Total$— $— $6.3 $9.5 $6.0 $22.2 $44.0 100.0 %
 Origination Year
Debt-service coverage ratios (2):20202019201820172016PriorTotal% of Total
Greater than 2.0$— $— $— $9.5 $6.0 $9.0 $24.5 55.7 %
1.5 to 2.0— — — — — 7.2 7.2 16.4 %
1.0 to 1.5— — 6.3 — — 6.0 12.3 27.9 %
Total$— $— $6.3 $9.5 $6.0 $22.2 $44.0 100.0 %
(1) LTV ratio derived from current loan balance divided by the fair value of the property. The fair value of the underlying commercial properties is updated at least annually.
(2) DSC ratio calculated using most recent reported operating income results from property operators divided by annual debt service coverage.