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Investments - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, Fair Value, and Other-Than-Temporary-Impairment of Fixed Maturity and Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 760.8 $ 774.0
Gross Unrealized Gains 196.3 114.5
Gross Unrealized Losses (0.4) (4.6)
Fair Value 956.7 883.9
OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 12.2 11.0
U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 0.6 10.8
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.7 10.9
U.S. government and government agencies and authorities | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 13.0 13.0
Gross Unrealized Gains 1.9 0.9
Gross Unrealized Losses 0.0 0.0
Fair Value 14.9 13.9
States, municipalities and political subdivisions | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 8.4 8.4
Gross Unrealized Gains 2.4 1.2
Gross Unrealized Losses 0.0 0.0
Fair Value 10.8 9.6
Foreign governments | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 102.1 80.4
Gross Unrealized Gains 0.7 0.1
Gross Unrealized Losses (0.4) (1.8)
Fair Value 102.4 78.7
Asset-backed | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 5.0 3.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 (0.2)
Fair Value 5.0 3.3
Commercial mortgage-backed | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 31.8 37.0
Gross Unrealized Gains 2.1 1.6
Gross Unrealized Losses 0.0 (0.4)
Fair Value 33.9 38.2
Residential mortgage-backed | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.6 1.0
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 491.3 497.8
Gross Unrealized Gains 154.8 91.1
Gross Unrealized Losses 0.0 (1.9)
Fair Value 646.1 587.0
U.S. corporate | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 11.6 10.0
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 108.6 123.1
Gross Unrealized Gains 34.3 19.5
Gross Unrealized Losses 0.0 (0.3)
Fair Value 142.9 142.3
Foreign corporate | OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI $ 0.0 $ 0.0