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Investments - Aging Of Gross Unrealized Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 238.6 $ 678.1
12 Months or More 441.9 0.5
Fair Value 680.5 678.6
Gross Unrealized Losses    
Less than 12 Months (7.8) (5.5)
12 Months or More (21.3) 0.0
Gross Unrealized Losses (29.1) (5.5)
Corporate debt securities    
Fair Value    
Less than 12 Months 198.4 581.9
12 Months or More 362.6 0.0
Fair Value 561.0 581.9
Gross Unrealized Losses    
Less than 12 Months (7.0) (4.7)
12 Months or More (17.5) 0.0
Gross Unrealized Losses (24.5) (4.7)
U.S. Government obligations    
Fair Value    
Less than 12 Months 36.8 95.0
12 Months or More 79.3 0.5
Fair Value 116.1 95.5
Gross Unrealized Losses    
Less than 12 Months (0.8) (0.8)
12 Months or More (3.8) 0.0
Gross Unrealized Losses (4.6) (0.8)
Municipal securities    
Fair Value    
Less than 12 Months 0.6 1.2
12 Months or More 0.0 0.0
Fair Value 0.6 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
Asset-backed securities    
Fair Value    
Less than 12 Months 2.8 0.0
12 Months or More 0.0 0.0
Fair Value 2.8 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