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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 62.0 $ 64.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.5 2.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.4 0.0
Debt Securities, Available-for-sale, Restricted [1] 62.1 66.1
Corporate bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 27.3 31.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.3 1.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.2 0.0
Debt Securities, Available-for-sale, Restricted 27.4 32.4
US Government and agency securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 21.5 19.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.2 0.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.1 0.0
Debt Securities, Available-for-sale, Restricted 21.6 20.4
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 12.9 12.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.0 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.1 0.0
Debt Securities, Available-for-sale, Restricted 12.8 12.9
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 0.3 0.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Restricted $ 0.3 $ 0.4
[1] Measured at fair value on a recurring basis.