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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 64.7 $ 58.3
Gross Unrealized Gains 2.1 1.0
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value [1] 66.8 59.3
Corporate Bond Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 30.0 25.3
Gross Unrealized Gains 1.1 0.5
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value 31.1 25.8
US Government and Agency Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 21.9 21.3
Gross Unrealized Gains 0.8 0.4
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value 22.7 21.7
Asset-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 12.3 11.2
Gross Unrealized Gains 0.2 0.1
Gross Unrealized Losses 0.0  
Estimated Fair Value 12.5 11.3
Mortgage-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 0.5 0.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value $ 0.5 $ 0.5
[1] Measured at fair value on a recurring basis.