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Investments - Continuous Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 months |  |
Fair Value | $ 100.8 | $ 200.6
Gross Unrealized Losses | (0.5) | 0.0
12 months or more |  |
Fair Value | 47.6 | 81.8
Gross Unrealized Losses | (3.6) | (4.1)
Total |  |
Fair Value | 148.4 | 282.4
Gross Unrealized Losses | (4.1) | (4.1)
U.S. government and agencies |  |
Less than 12 months |  |
Fair Value | 9.0 | 4.3
Gross Unrealized Losses | (0.1) | 0.0
12 months or more |  |
Fair Value | 5.9 | 10.5
Gross Unrealized Losses | (0.1) | (0.2)
Total |  |
Fair Value | 14.9 | 14.8
Gross Unrealized Losses | (0.2) | (0.2)
States and other territories |  |
Less than 12 months |  |
Fair Value | 0.2 | 1.5
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 7.5 | 7.4
Gross Unrealized Losses | (0.4) | (0.4)
Total |  |
Fair Value | 7.7 | 8.9
Gross Unrealized Losses | (0.4) | (0.4)
Corporate securities |  |
Less than 12 months |  |
Fair Value | 46.9 | 5.7
Gross Unrealized Losses | (0.3) | 0.0
12 months or more |  |
Fair Value | 5.9 | 37.4
Gross Unrealized Losses | (1.1) | (1.3)
Total |  |
Fair Value | 52.8 | 43.1
Gross Unrealized Losses | (1.4) | (1.3)
Foreign securities |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 4.0 | 0.9
Gross Unrealized Losses | 0.0 | 0.0
Total |  |
Fair Value | 4.0 | 0.9
Gross Unrealized Losses | 0.0 | 0.0
Residential mortgage-backed securities |  |
Less than 12 months |  |
Fair Value | 4.7 | 0.0
Gross Unrealized Losses | (0.1) | 0.0
12 months or more |  |
Fair Value | 10.7 | 11.6
Gross Unrealized Losses | (1.5) | (1.3)
Total |  |
Fair Value | 15.4 | 11.6
Gross Unrealized Losses | (1.6) | (1.3)
Commercial mortgage-backed securities |  |
Less than 12 months |  |
Fair Value | 0.4 | 0.4
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 5.9 | 5.8
Gross Unrealized Losses | (0.4) | (0.6)
Total |  |
Fair Value | 6.3 | 6.2
Gross Unrealized Losses | (0.4) | (0.6)
Asset backed securities |  |
Less than 12 months |  |
Fair Value | 1.8 | 1.6
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 7.7 | 8.2
Gross Unrealized Losses | (0.1) | (0.3)
Total |  |
Fair Value | 9.5 | 9.8
Gross Unrealized Losses | (0.1) | (0.3)
U.S. government and agencies |  |
Less than 12 months |  |
Fair Value | 5.2 | 137.7
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Total |  |
Fair Value | 5.2 | 137.7
Gross Unrealized Losses | 0.0 | 0.0
Commercial paper |  |
Less than 12 months |  |
Fair Value | 19.4 | 34.5
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Total |  |
Fair Value | 19.4 | 34.5
Gross Unrealized Losses | 0.0 | 0.0
Corporate securities |  |
Less than 12 months |  |
Fair Value | 13.2 | 14.9
Gross Unrealized Losses | 0.0 | 0.0
12 months or more |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Total |  |
Fair Value | 13.2 | 14.9
Gross Unrealized Losses | $ 0.0 | $ 0.0

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