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Investments - Aging Of Gross Unrealized Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 670.7 $ 678.1
12 Months or More 0.5 0.5
Fair Value 671.2 678.6
Gross Unrealized Losses    
Less than 12 Months (19.8) (5.5)
12 Months or More 0.0 0.0
Gross Unrealized Losses (19.8) (5.5)
Corporate debt securities    
Fair Value    
Less than 12 Months 574.4 581.9
12 Months or More 0.0 0.0
Fair Value 574.4 581.9
Gross Unrealized Losses    
Less than 12 Months (16.8) (4.7)
12 Months or More 0.0 0.0
Gross Unrealized Losses (16.8) (4.7)
U.S. Government obligations    
Fair Value    
Less than 12 Months 95.1 95.0
12 Months or More 0.5 0.5
Fair Value 95.6 95.5
Gross Unrealized Losses    
Less than 12 Months (3.0) (0.8)
12 Months or More 0.0 0.0
Gross Unrealized Losses (3.0) (0.8)
Municipal securities    
Fair Value    
Less than 12 Months 1.2 1.2
12 Months or More 0.0 0.0
Fair Value 1.2 1.2
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