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Investments - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value    
12 Months or Longer $ 10.6 $ 10.4
Total unrealized loss position 10.6 10.4
Unrealized Losses    
12 Months or Longer (1.4) (1.9)
Total accumulated unrealized loss position $ 1.4 $ 1.9