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Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Maturities of Fixed Maturity Securities Available-for-Sale
The amortized cost and fair value of fixed maturity securities available-for-sale as of December 31, 2019 are shown by contractual maturity in the table below (in millions). Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date:

Amortized
Cost		Fair
Value
Corporate, Municipal, U.S. Government and Other securities
Due in one year or less$32.3  $33.2  
Due after one year through five years243.2  250.8  
Due after five years through ten years416.9  440.3  
Due after ten years2,289.1  2,550.5  
Subtotal2,981.5  3,274.8  
Mortgage-backed securities171.2  176.3  
Asset-backed securities592.6  577.8  
Total$3,745.3  $4,028.9  
Schedule of Major Industry Types of Fixed Maturity Holdings
The tables below show the major industry types of the Company’s corporate and other fixed maturity securities (in millions):

December 31, 2019December 31, 2018
Amortized
Cost		Fair
Value		% of
Total		Amortized
Cost		Fair
Value		% of
Total
Finance, insurance, and real estate$632.2  $674.9  23.8 %$469.0  $452.9  20.2 %
Transportation, communication and other services785.7  855.2  30.3 %758.6  734.0  32.7 %
Manufacturing728.7  825.9  29.2 %712.7  693.5  30.9 %
Other422.5  471.0  16.7 %370.7  364.1  16.2 %
Total$2,569.1  $2,827.0  100.0 %$2,311.0  $2,244.5  100.0 %
Other than Temporary Impairment, Credit Losses Recognized in Earnings Any remaining difference between the fair value and amortized cost is recognized in AOCI. The Company recognized the following (in millions):
Years Ended December 31,
20192018
Net realized and unrealized gains on investments$2.1  $1.5  
Other income (expenses), net0.3  0.2  
Total other-than-temporary impairments$2.4  $1.7  
Schedule of Debt Securities, Available-for-sale
The following tables provide information relating to investments in fixed maturity securities (in millions):

December 31, 2019
Amortized
Cost
Unrealized
Gains		Unrealized
Losses
Fair
Value
U.S. Government and government agencies$7.0  $0.7  $—  $7.7  
States, municipalities and political subdivisions405.4  34.7  —  440.1  
Residential mortgage-backed securities63.0  4.5  (0.6) 66.9  
Commercial mortgage-backed securities108.2  1.8  (0.6) 109.4  
Asset-backed securities592.6  2.2  (17.0) 577.8  
Corporate and other2,569.1  273.1  (15.2) 2,827.0  
Total fixed maturity securities$3,745.3  $317.0  $(33.4) $4,028.9  

December 31, 2018Amortized
Cost		Unrealized
Gains		Unrealized
Losses
Fair
Value
U.S. Government and government agencies$24.7  $0.7  $—  $25.4  
States, municipalities and political subdivisions413.7  9.6  (1.4) 421.9  
Residential mortgage-backed securities92.6  3.1  (1.3) 94.4  
Commercial mortgage-backed securities94.7  0.3  (1.1) 93.9  
Asset-backed securities540.8  0.8  (30.1) 511.5  
Corporate and other2,311.0  17.0  (83.5) 2,244.5  
Total fixed maturity securities$3,477.5  $31.5  $(117.4) $3,391.6  
The following table presents the total unrealized losses for the 139 and 749 fixed maturity securities held by the Company as of December 31, 2019 and December 31, 2018, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (in millions):

December 31, 2019December 31, 2018
Fixed maturity securitiesUnrealized Losses% of
Total		Unrealized Losses% of
Total
Less than 20%$(32.6) 97.6 %$(116.0) 98.8 %
20% or more for less than six months—  — %(0.8) 0.7 %
20% or more for six months or greater(0.8) 2.4 %(0.6) 0.5 %
Total$(33.4) 100.0 %$(117.4) 100.0 %
Schedule of Estimated Fair Value and Gross Unrealized Loss
The following tables present the estimated fair values and gross unrealized losses for the 139 and 749 fixed maturity securities held by the Company that have estimated fair values below amortized cost as of each of December 31, 2019 and December 31, 2018, respectively. The Company does not have any OTTI losses reported in AOCI. These investments are presented by investment category and the length of time the related fair value has remained below amortized cost (in millions):

December 31, 2019Less than 12 months 12 months or greaterTotal
Fair
Value
Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Government and government agencies$0.3  $—  $—  $—  $0.3  $—  
States, municipalities and political subdivisions2.0  —  —  —  2.0  —  
Residential mortgage-backed securities2.3  —  8.2  (0.6) 10.5  (0.6) 
Commercial mortgage-backed securities58.1  (0.6) 0.2  —  58.3  (0.6) 
Asset-backed securities126.5  (1.5) 255.8  (15.5) 382.3  (17.0) 
Corporate and other169.6  (3.7) 177.4  (11.5) 347.0  (15.2) 
Total fixed maturity securities$358.8  $(5.8) $441.6  $(27.6) $800.4  $(33.4) 

December 31, 2018Less than 12 months 12 months of greaterTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Government and government agencies$5.0  $—  $3.3  $—  $8.3  $—  
States, municipalities and political subdivisions117.2  (1.3) 1.9  (0.1) 119.1  (1.4) 
Residential mortgage-backed securities22.4  (1.2) 5.7  (0.1) 28.1  (1.3) 
Commercial mortgage-backed securities57.8  (1.1) —  —  57.8  (1.1) 
Asset-backed securities466.0  (29.6) 5.9  (0.5) 471.9  (30.1) 
Corporate and other1,418.2  (71.9) 254.6  (11.6) 1,672.8  (83.5) 
Total fixed maturity securities$2,086.6  $(105.1) $271.4  $(12.3) $2,358.0  $(117.4) 
Debt Securities, Trading, and Equity Securities, FV-NI
The following tables provide information relating to investments in equity securities measured at fair value (in millions):

December 31,
Equity securities20192018
Common stock$10.5  $15.0  
Perpetual preferred stock82.0  185.5  
Total equity securities$92.5  $200.5  
Schedule of Other Invested Assets
Carrying values of other invested assets were as follows (in millions):

December 31, 2019December 31, 2018
Measurement
Alternative		Equity
Method		Measurement
Alternative 		 Equity
Method 		 
Common stock$—  $2.4  $—  $2.1  
Preferred stock—  16.1  1.6  9.6  
Other—  66.5  —  59.2  
Total$—  $85.0  $1.6  $70.9  
Summarized Information for Equity Method Investments Summarized financial information for equity method investees not consolidated as of and for the year ended December 31, 2018 were as follows (information for one of the investees is reported on a one month lag, in millions):
Years Ended December 31,
20192018
Net revenue$462.0  $382.9  
Gross profit$88.1  $98.8  
Income from continuing operations$4.1  $38.7  
Net income$2.0  $30.9  
Current assets$373.3  $282.5  
Noncurrent assets$95.1  $90.5  
Current liabilities$246.9  $177.0  
Noncurrent liabilities$18.9  $19.5  
Net Investment Income
The major sources of net investment income were as follows (in millions):

Years Ended December 31,
20192018
Fixed maturity securities, available-for-sale at fair value$177.3  $98.3  
Equity securities7.6  5.4  
Mortgage loans15.0  7.3  
Policy loans1.1  1.2  
Other invested assets4.0  4.8  
Gross investment income205.0  117.0  
External investment expense(1.2) (0.4) 
Net investment income$203.8  $116.6  
Net Realized Gain (Loss) on Investments
The major sources of net realized and unrealized gains and losses on investments were as follows (in millions):

Years Ended December 31,
20192018
Realized gains on fixed maturity securities$10.6  $5.6  
Realized losses on fixed maturity securities(10.2) (1.5) 
Realized gains on equity securities3.4  0.3  
Realized losses on equity securities(3.3) —  
Realized gains on mortgage loans1.0  —  
Realized losses on mortgage loans(0.3) —  
Net unrealized gains (losses) on equity securities3.4  (11.6) 
Net unrealized gains (losses) on derivative instruments(1.7) 0.3  
Impairment loss(2.2) (1.5) 
Net realized and unrealized gains (losses)$0.7  $(8.4)