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Investments in Available-for-Sale Securities (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investments in Available-for-Sale Securities    
Unrealized losses owned for less than 12 months $ 45.3 $ 72.3
Unrealized losses owed for over a year $ 8.1 $ 0.0