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Investments - Continuous Loss Position (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | $ 200.6 | $ 341.9
Less than 12 months, Gross Unrealized Losses | 0.0 | (3.3)
12 months or more, Fair Value | 81.8 | 32.8
12 months or more, Gross Unrealized Losses | (4.1) | (3.9)
Total, Fair Value | 282.4 | 374.7
Total, Gross Unrealized Losses | (4.1) | (7.2)
U.S. government and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 4.3 | 17.9
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.4)
12 months or more, Fair Value | 10.5 | 1.1
12 months or more, Gross Unrealized Losses | (0.2) | (0.1)
Total, Fair Value | 14.8 | 19.0
Total, Gross Unrealized Losses | (0.2) | (0.5)
States and other territories |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 1.5 | 3.6
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.1)
12 months or more, Fair Value | 7.4 | 4.6
12 months or more, Gross Unrealized Losses | (0.4) | (0.5)
Total, Fair Value | 8.9 | 8.2
Total, Gross Unrealized Losses | (0.4) | (0.6)
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 5.7 | 30.5
Less than 12 months, Gross Unrealized Losses | 0.0 | (1.5)
12 months or more, Fair Value | 37.4 | 11.1
12 months or more, Gross Unrealized Losses | (1.3) | (0.9)
Total, Fair Value | 43.1 | 41.6
Total, Gross Unrealized Losses | (1.3) | (2.4)
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 0.0 | 0.0
Less than 12 months, Gross Unrealized Losses | 0.0 | 0.0
12 months or more, Fair Value | 0.9 | 0.8
12 months or more, Gross Unrealized Losses | 0.0 | (0.1)
Total, Fair Value | 0.9 | 0.8
Total, Gross Unrealized Losses | 0.0 | (0.1)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 0.0 | 6.3
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.3)
12 months or more, Fair Value | 11.6 | 7.6
12 months or more, Gross Unrealized Losses | (1.3) | (1.3)
Total, Fair Value | 11.6 | 13.9
Total, Gross Unrealized Losses | (1.3) | (1.6)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 0.4 | 1.9
Less than 12 months, Gross Unrealized Losses | 0.0 | 0.0
12 months or more, Fair Value | 5.8 | 3.9
12 months or more, Gross Unrealized Losses | (0.6) | (0.7)
Total, Fair Value | 6.2 | 5.8
Total, Gross Unrealized Losses | (0.6) | (0.7)
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 1.6 | 5.5
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.2)
12 months or more, Fair Value | 8.2 | 3.7
12 months or more, Gross Unrealized Losses | (0.3) | (0.3)
Total, Fair Value | 9.8 | 9.2
Total, Gross Unrealized Losses | (0.3) | (0.5)
U.S. government and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 137.7 | 129.1
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.2)
12 months or more, Fair Value | 0.0 | 0.0
12 months or more, Gross Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 137.7 | 129.1
Total, Gross Unrealized Losses | 0.0 | (0.2)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 34.5 | 147.1
Less than 12 months, Gross Unrealized Losses | 0.0 | (0.6)
12 months or more, Fair Value | 0.0 | 0.0
12 months or more, Gross Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 34.5 | 147.1
Total, Gross Unrealized Losses | 0.0 | $ (0.6)
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 14.9 |
Less than 12 months, Gross Unrealized Losses | 0.0 |
12 months or more, Fair Value | 0.0 |
12 months or more, Gross Unrealized Losses | 0.0 |
Total, Fair Value | 14.9 |
Total, Gross Unrealized Losses | $ 0.0 |

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