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3. Fair Value Measurements Fair Value and Gross Unrealized Losses with Unrealized Losses (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 91.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 19.9
Gross unrealized losses for investments in a loss position 12 months or more 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position 111.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0.4
Asset-backed Securities [Member]  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 17.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7.0
Gross unrealized losses for investments in a loss position 12 months or more 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position 24.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0.1
Corporate Debt Securities [Member]  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 46.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2.1
Gross unrealized losses for investments in a loss position 12 months or more 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position 48.6
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0.1
US Government Sponsored Agencies [Member]  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 27.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10.8
Gross unrealized losses for investments in a loss position 12 months or more 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position 38.3
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 0.2