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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Restricted Securities Available For Sale [Line Items]    
Estimated Fair Value, Less than 12 Months $ 22.8 $ 2.2
Gross Unrealized Losses, Less than 12 Months (0.2) 0.0
Estimated Fair Value, 12 Months or More 0.0 0.0
Gross Unrealized Losses, 12 Months or More 0.0 0.0
Total Estimated Fair Value 22.8 2.2
Total Gross Unrealized Losses (0.2) 0.0
Corporate Bond Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Estimated Fair Value, Less than 12 Months 16.7 2.2
Gross Unrealized Losses, Less than 12 Months (0.2) 0.0
Estimated Fair Value, 12 Months or More 0.0 0.0
Gross Unrealized Losses, 12 Months or More 0.0 0.0
Total Estimated Fair Value 16.7 2.2
Total Gross Unrealized Losses (0.2) 0.0
US Government and Agency Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Estimated Fair Value, Less than 12 Months 3.4 0.0
Gross Unrealized Losses, Less than 12 Months 0.0 0.0
Estimated Fair Value, 12 Months or More 0.0 0.0
Gross Unrealized Losses, 12 Months or More 0.0 0.0
Total Estimated Fair Value 3.4 0.0
Total Gross Unrealized Losses 0.0 0.0
Asset-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Estimated Fair Value, Less than 12 Months 2.7 0.0
Gross Unrealized Losses, Less than 12 Months 0.0  
Estimated Fair Value, 12 Months or More 0.0 0.0
Gross Unrealized Losses, 12 Months or More 0.0 0.0
Total Estimated Fair Value 2.7 0.0
Mortgage-backed Securities [Member]    
Restricted Securities Available For Sale [Line Items]    
Estimated Fair Value, Less than 12 Months 0.0 0.0
Estimated Fair Value, 12 Months or More 0.0 0.0
Gross Unrealized Losses, 12 Months or More 0.0 0.0
Total Estimated Fair Value $ 0.0 $ 0.0