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Fair Value (Available-For-Sale Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value Disclosure [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position $ 0.0 $ 17.2
Amortized Cost 156.1 150.1
Gross Unrealized Gains 7.4 4.3
Gross Unrealized Losses (1.0) [1] (0.2) [2]
Allowance for Credit Loss (0.7) 0.0
Fair Value 161.8 154.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 20.4 12.2
U.S. Treasury debt securities    
Fair Value Disclosure [Line Items]    
Amortized Cost 31.5 31.4
Gross Unrealized Gains 0.4 0.1
Gross Unrealized Losses 0.0 [1] (0.1) [2]
Fair Value 31.9 31.4
Corporate/Other debt securities    
Fair Value Disclosure [Line Items]    
Amortized Cost 124.6 118.7
Gross Unrealized Gains 7.0 4.2
Gross Unrealized Losses (1.0) [1] (0.1) [2]
Fair Value $ 129.9 $ 122.8
[1] (1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 and $20.4 million, respectively, at September 30, 2020.
[2] (2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $17.2 million and $12.2 million, respectively, at December 31, 2019.