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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 67.0 $ 64.1
Gross Unrealized Gains 1.3 2.0
Gross Unrealized Losses (0.2) 0.0
Estimated Fair Value [1] 68.1 66.1
Corporate Bond Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 34.8 31.3
Gross Unrealized Gains 0.7 1.1
Gross Unrealized Losses (0.2) 0.0
Estimated Fair Value 35.3 32.4
US Government and Agency Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 19.2 19.7
Gross Unrealized Gains 0.5 0.7
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value 19.7 20.4
Asset-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 12.6 12.7
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses 0.0  
Estimated Fair Value 12.7 12.9
Mortgage-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 0.4 0.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value $ 0.4 $ 0.4
[1] Measured at fair value on a recurring basis.