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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 58.7 $ 59.0
Gross Unrealized Gains 1.1 0.1
Gross Unrealized Losses 0.0 (0.5)
Estimated Fair Value [1] 59.8 58.6
Corporate Bond Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 24.9 23.4
Gross Unrealized Gains 0.6 0.0
Gross Unrealized Losses 0.0 (0.2)
Estimated Fair Value 25.5 23.2
US Government and Agency Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 22.0 24.8
Gross Unrealized Gains 0.4 0.1
Gross Unrealized Losses 0.0 (0.2)
Estimated Fair Value 22.4 24.7
Asset-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 11.0 9.4
Gross Unrealized Gains 0.1 0.0
Gross Unrealized Losses 0.0 (0.1)
Estimated Fair Value 11.1 9.3
Mortgage-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 0.8 1.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Estimated Fair Value $ 0.8 $ 1.4
[1]
Measured at fair value on a recurring basis.