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Investments - Aging Of Gross Unrealized Losses (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value    
Less than 12 Months $ 678.1 $ 0.0
12 Months or More 0.5 0.0
Fair Value 678.6 0.0
Gross Unrealized Losses    
Less than 12 Months (5.5) 0.0
12 Months or More 0.0 0.0
Gross Unrealized Losses (5.5) 0.0
Corporate debt securities    
Fair Value    
Less than 12 Months 581.9 0.0
12 Months or More 0.0 0.0
Fair Value 581.9 0.0
Gross Unrealized Losses    
Less than 12 Months (4.7) 0.0
12 Months or More 0.0 0.0
Gross Unrealized Losses (4.7) 0.0
U.S. Government obligations    
Fair Value    
Less than 12 Months 95.0 0.0
12 Months or More 0.5 0.0
Fair Value 95.5 0.0
Gross Unrealized Losses    
Less than 12 Months (0.8) 0.0
12 Months or More 0.0 0.0
Gross Unrealized Losses (0.8) 0.0
Municipal securities    
Fair Value    
Less than 12 Months 1.2 0.0
12 Months or More 0.0 0.0
Fair Value 1.2 0.0
Gross Unrealized Losses    
Less than 12 Months 0.0 0.0
12 Months or More 0.0 0.0
Gross Unrealized Losses $ 0.0 $ 0.0