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Investments - Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 43.4 $ 46.7
Gross Unrealized Gains 3.3 2.2
Gross Unrealized Losses 0.0 (0.2)
Fair Value 46.7 48.7
U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 0.8 0.8
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.9 0.9
State, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 3.1 3.0
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses 0.0 0.0
Fair Value 3.2 3.2
Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 0.3 0.2
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.4 0.3
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost   7.9
Gross Unrealized Gains   0.0
Gross Unrealized Losses   0.0
Fair Value   7.9
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 2.0 2.4
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 2.1 2.5
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 29.8 24.3
Gross Unrealized Gains 2.1 1.2
Gross Unrealized Losses 0.0 (0.1)
Fair Value 31.9 25.4
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 7.4 8.1
Gross Unrealized Gains 0.8 0.5
Gross Unrealized Losses 0.0 (0.1)
Fair Value 8.2 8.5
OTTI    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.1
OTTI | U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | State, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0.0
OTTI | Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.1
OTTI | U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI $ 0.0 $ 0.0