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v3.23.3

Investments - Aging of Gross Unrealized Losses (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 321.3 | $ 116.0
12 Months or More | 279.5 | 513.2
Fair Value | 600.8 | 629.2
Gross Unrealized Losses |  |
Less than 12 Months | (3.2) | (2.3)
12 Months or More | (8.8) | (21.0)
Gross Unrealized Losses | (12.0) | (23.3)
Corporate debt securities |  |
Fair Value |  |
Less than 12 Months | 204.5 | 83.6
12 Months or More | 216.7 | 428.1
Fair Value | 421.2 | 511.7
Gross Unrealized Losses |  |
Less than 12 Months | (2.2) | (2.1)
12 Months or More | (6.9) | (17.5)
Gross Unrealized Losses | (9.1) | (19.6)
U.S. Government obligations |  |
Fair Value |  |
Less than 12 Months | 116.8 | 29.6
12 Months or More | 62.4 | 85.1
Fair Value | 179.2 | 114.7
Gross Unrealized Losses |  |
Less than 12 Months | (1.0) | (0.2)
12 Months or More | (1.9) | (3.5)
Gross Unrealized Losses | (2.9) | (3.7)
Asset-backed securities |  |
Fair Value |  |
Less than 12 Months | 0.0 | 2.8
12 Months or More | 0.4 | 0.0
Fair Value | 0.4 | 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

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