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Investments - Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 46.7 $ 51.2
Cost or Amortized Cost 47.4  
Fair Value 48.7 54.6
Fair Value 49.4  
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 46.7  
Cost or Amortized Cost 46.7 51.2
Gross Unrealized Gains 2.2  
Gross Unrealized Gains   3.5
Gross Unrealized Losses (0.2)  
Gross Unrealized Losses   (0.1)
Fair Value 48.7  
Fair Value 48.7 54.6
Fixed maturity securities | U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 0.8  
Cost or Amortized Cost   0.7
Gross Unrealized Gains 0.1  
Gross Unrealized Gains   0.1
Gross Unrealized Losses 0.0  
Gross Unrealized Losses   0.0
Fair Value 0.9  
Fair Value   0.8
Fixed maturity securities | State, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 3.0  
Cost or Amortized Cost   4.0
Gross Unrealized Gains 0.2  
Gross Unrealized Gains   0.2
Gross Unrealized Losses 0.0  
Gross Unrealized Losses   0.0
Fair Value 3.2  
Fair Value   4.2
Fixed maturity securities | Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 0.2  
Cost or Amortized Cost   0.2
Gross Unrealized Gains 0.1  
Gross Unrealized Gains   0.2
Gross Unrealized Losses 0.0  
Gross Unrealized Losses   0.0
Fair Value 0.3  
Fair Value   0.4
Fixed maturity securities | Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 7.9  
Cost or Amortized Cost   8.2
Gross Unrealized Gains 0.0  
Gross Unrealized Gains   0.0
Gross Unrealized Losses 0.0  
Gross Unrealized Losses   0.0
Fair Value 7.9  
Fair Value   8.2
Fixed maturity securities | Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 2.4  
Cost or Amortized Cost   2.9
Gross Unrealized Gains 0.1  
Gross Unrealized Gains   0.3
Gross Unrealized Losses 0.0  
Gross Unrealized Losses   0.0
Fair Value 2.5  
Fair Value   3.2
Fixed maturity securities | U.S. Corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 24.3  
Cost or Amortized Cost   27.5
Gross Unrealized Gains 1.2  
Gross Unrealized Gains   2.0
Gross Unrealized Losses (0.1)  
Gross Unrealized Losses   (0.1)
Fair Value 25.4  
Fair Value   29.4
Fixed maturity securities | Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 8.1  
Cost or Amortized Cost   7.7
Gross Unrealized Gains 0.5  
Gross Unrealized Gains   0.7
Gross Unrealized Losses (0.1)  
Gross Unrealized Losses   0.0
Fair Value 8.5  
Fair Value   8.4
Equity securities | Non-redeemable preferred stocks    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost   0.1
Gross Unrealized Gains   0.1
Gross Unrealized Losses   0.0
Fair Value   0.2
OTTI | Available-for-sale Securities | Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.1 0.2
OTTI | Available-for-sale Securities | Fixed maturity securities | U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Available-for-sale Securities | Fixed maturity securities | State, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Available-for-sale Securities | Fixed maturity securities | Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Available-for-sale Securities | Fixed maturity securities | Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   0.0
OTTI | Available-for-sale Securities | Fixed maturity securities | Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.1 0.2
OTTI | Available-for-sale Securities | Fixed maturity securities | U.S. Corporate    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0.0 0.0
OTTI | Available-for-sale Securities | Fixed maturity securities | Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI $ 0.0 0.0
OTTI | Available-for-sale Securities | Equity securities | Non-redeemable preferred stocks    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI   $ 0.0