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Investments - Aging of Gross Unrealized Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 147.6 $ 116.0
12 Months or More 421.9 513.2
Fair Value 569.5 629.2
Gross Unrealized Losses    
Less than 12 Months (2.0) (2.3)
12 Months or More (15.9) (21.0)
Gross Unrealized Losses (17.9) (23.3)
Corporate debt securities    
Fair Value    
Less than 12 Months 116.5 83.6
12 Months or More 368.3 428.1
Fair Value 484.8 511.7
Gross Unrealized Losses    
Less than 12 Months (1.8) (2.1)
12 Months or More (13.4) (17.5)
Gross Unrealized Losses (15.2) (19.6)
U.S. Government obligations    
Fair Value    
Less than 12 Months 29.3 29.6
12 Months or More 53.6 85.1
Fair Value 82.9 114.7
Gross Unrealized Losses    
Less than 12 Months (0.2) (0.2)
12 Months or More (2.5) (3.5)
Gross Unrealized Losses (2.7) (3.7)
Asset-backed securities    
Fair Value    
Less than 12 Months 1.8 2.8
12 Months or More 0.0 0.0
Fair Value 1.8 2.8
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