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Investments - Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investments    
Cost or Amortized Cost $ 52.6  
Fair Value 56.1  
Fixed maturity securities    
Investments    
Cost or Amortized Cost 51.2 $ 32.0
Gross Unrealized Gains 3.5 3.6
Gross Unrealized Losses (0.1) 0.0
Fair Value 54.6 35.6
Fixed maturity securities | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.2 0.3
Fixed maturity securities | United States government and government agencies and authorities    
Investments    
Cost or Amortized Cost 0.7 0.7
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.8 0.8
Fixed maturity securities | United States government and government agencies and authorities | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.0 0.0
Fixed maturity securities | States, municipalities and political subdivisions    
Investments    
Cost or Amortized Cost 4.0 6.4
Gross Unrealized Gains 0.2 0.4
Gross Unrealized Losses 0.0 0.0
Fair Value 4.2 6.8
Fixed maturity securities | States, municipalities and political subdivisions | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.0 0.0
Fixed maturity securities | Foreign governments    
Investments    
Cost or Amortized Cost 0.2 0.3
Gross Unrealized Gains 0.2 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.4 0.4
Fixed maturity securities | Foreign governments | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.0 0.0
Fixed maturity securities | Asset-backed    
Investments    
Cost or Amortized Cost 8.2  
Gross Unrealized Gains 0.0  
Gross Unrealized Losses 0.0  
Fair Value 8.2  
Fixed maturity securities | Residential mortgage-backed    
Investments    
Cost or Amortized Cost 2.9 3.1
Gross Unrealized Gains 0.3 0.5
Gross Unrealized Losses 0.0 0.0
Fair Value 3.2 3.6
Fixed maturity securities | Residential mortgage-backed | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.2 0.3
Fixed maturity securities | U.S. corporate    
Investments    
Cost or Amortized Cost 27.5 17.7
Gross Unrealized Gains 2.0 1.9
Gross Unrealized Losses (0.1) 0.0
Fair Value 29.4 19.6
Fixed maturity securities | U.S. corporate | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.0 0.0
Fixed maturity securities | Foreign corporate    
Investments    
Cost or Amortized Cost 7.7 3.8
Gross Unrealized Gains 0.7 0.6
Gross Unrealized Losses 0.0 0.0
Fair Value 8.4 4.4
Fixed maturity securities | Foreign corporate | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0.0 0.0
Equity securities | Non-redeemable preferred stocks    
Investments    
Cost or Amortized Cost 0.1 0.1
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses 0.0 0.0
Fair Value 0.2 0.2
Equity securities | Non-redeemable preferred stocks | OTTI in AOCI | Available-for-sale securities.    
Investments    
OTTI in AOCI $ 0.0 $ 0.0