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Fair Value Disclosures (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of the Company's Fair Value Hierarchy for Recurring Basis Assets and Liabilities
The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 and 2019. The amounts presented below for other investments, cash equivalents, assets held in and liabilities related to separate accounts differ from the amounts presented in the balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. The fair value amount and the majority of the associated levels presented for assets and liabilities held in separate accounts are received directly from third parties.
 December 31, 2020
 TotalLevel 1Level 2Level 3
Financial Assets
Fixed maturity securities:
U.S. government and government
 agencies and authorities
$0.7 $—  $0.7  $—  
State, municipalities and political subdivisions15.5 —  15.5  —  
Foreign governments24.1 —  24.1  —  
Asset-backed100.2 —  100.2  —  
Commercial mortgage-backed8.0 —  4.0  4.0  
Residential mortgage-backed30.1 —  30.1  —  
U.S. corporate651.0 —  650.1  0.9  
Foreign corporate132.2 — 124.6 7.6 
Equity securities:
Common stocks1.9 1.9  —  —  
Non-redeemable preferred stocks67.9 —  66.9  1.0  
Other investments17.7 17.7 (1)— — 
Cash equivalents1.2 1.2 (1)— — 
Assets held in separate accounts2,010.6 1,936.4 (2)74.2 (3)—  
Total financial assets$3,061.1 $1,957.2 $1,090.4 $13.5  
Financial Liabilities
Liabilities related to separate accounts$2,010.6 $1,936.4 (2)$74.2 (3)$—  
 December 31, 2019
 TotalLevel 1Level 2Level 3
Financial Assets
Fixed maturity securities:
U.S. government and government
 agencies and authorities
$0.7 $—  $0.7  $—  
State, municipalities and political subdivisions14.9 —  14.9  —  
Foreign governments10.8 —  10.8  —  
Asset-backed102.4 —  102.4  —  
Commercial mortgage-backed5.0 —  1.5  3.5  
Residential mortgage-backed33.9 —  33.9  —  
U.S. corporate646.1 —  646.0  0.1  
Foreign corporate142.9 — 134.8 8.1 
Equity securities:
Common stocks2.3 2.3  —  —  
Non-redeemable preferred stocks73.0 —  71.9  1.1  
Other investments4.6 4.6 (1)— — 
Cash equivalents3.2 3.2 — — 
Other assets— —  —  — 
Assets held in separate accounts1,661.6 1,588.0 (2)73.6 (3)—  
Total financial assets$2,701.4 $1,598.1 $1,090.5 $12.8  
Financial Liabilities
Liabilities related to separate accounts$1,661.6 $1,588.0 (2)$73.6 (3)$—  
(1)  Primarily includes money market funds.
(2)  Primarily includes mutual funds and related obligations.
(3)  Primarily includes fixed maturity securities and related obligations.
Summary of the Change in Balance Sheet Carrying Value Associated with Level 3 Financial Assets Carried at Fair Value
The following tables summarize the change in balance sheet carrying value associated with Level 3 financial assets carried at fair value during the years ended December 31, 2019 and 2018:
 Year Ended December 31, 2020
 Balance,
beginning
of period		Total
gains (losses)
(realized/
unrealized)
included in
earnings (1)
Net
unrealized
(losses) gains
included in
other comprehensive
 income (2)
PurchasesSalesTransfers
in (3)		Transfers
out (3)		Balance,
end of
period
Fixed maturity securities:
Asset-backed$— $— $0.1 $2.0 $— $— $(2.1)— 
Commercial mortgage-backed3.5 0.1 0.4 — — — — 4.0 
U.S. corporate0.1 — — 0.8 — — — 0.9 
Foreign corporate8.1 — 0.1 — (0.6)— — 7.6 
Equity securities:
Non-redeemable preferred
 stocks
1.1 — (0.1)— — — — 1.0 
Total level 3 assets$12.8 $0.1 $0.5 $2.8 $(0.6)$— $(2.1)$13.5 
 Year Ended December 31, 2019
 Balance,
beginning
of period		Total
gains (losses)
(realized/
unrealized)
included in
earnings (1)
Net
unrealized
losses
included in
other comprehensive
 income (2)
PurchasesSalesTransfers
in (3)		Transfers
out (3)		Balance,
end of
period
Fixed maturity securities:
Asset-backed$— $— $— $8.5 $— $— $(8.5)— 
Commercial mortgage-backed3.3 — 0.2 — — — — 3.5 
U.S. corporate— — — — — 1.0 (0.9)0.1 
Foreign corporate8.2 — 0.4 — (0.5)— — 8.1 
Equity securities:
Non-redeemable preferred
 stocks
1.1 — — — — — — 1.1 
Other assets0.1 (0.1)— — — — — — 
Total level 3 assets$12.7 $(0.1)$0.6 $8.5 $(0.5)$1.0 $(9.4)$12.8 
(1)  Included as part of net realized gains on investments, excluding other-than-temporary impairment losses, in the statement of operations.
(2)  Included as part of change in unrealized gains on securities in the statement of comprehensive income.
(3) Transfers are primarily attributable to changes in the availability of observable market information and re-evaluation of the observability of valuation inputs.
Schedule of Carrying Value, Fair Value Amount and Hierarchy Level of the Financial Instruments That Are Not Recognized or Are Not Carried at Fair Value
The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the balance sheets as of the dates indicated:
 December 31, 2020
  Fair Value
 
Carrying
 Value
TotalLevel 1Level 2Level 3
Financial assets:
Commercial mortgage loans on real estate$43.9 $50.0 $— $— $50.0 
Policy loans5.3 5.3 5.3 — — 
Other investments0.2 0.2 — — 0.2 
Total financial assets$49.4 $55.5 $5.3 $— $50.2 
Financial liabilities:
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1)$194.1 $241.2 $— $— $241.2 

 December 31, 2019
  Fair Value
 
Carrying
 Value
TotalLevel 1Level 2Level 3
Financial assets:
Commercial mortgage loans on real estate$47.4 $50.8 $— $— $50.8 
Policy loans5.6 5.6 5.6 — — 
Other investments0.2 0.2 — — 0.2 
Total financial assets$53.2 $56.6 $5.6 $— $51.0 
Financial liabilities:
Policy reserves under investment products
 (Individual and group annuities, subject to
 discretionary withdrawal) (1)
$196.3 $230.0 $— $— $230.0 
(1)  Only the fair value of the Company's policy reserves for investment-type contracts (those without significant mortality or morbidity risk) are reflected in the table above.