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Fair Value Measurements - Credit Ratings (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | $ 71.6 | $ 71.9
AA+ |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | 13.4 | 13.4
AA |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | 0.0 | 0.0
Standard & Poor's, AA- Rating |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | 10.5 | 10.6
A |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | 13.2 | 13.3
A- |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | 14.1 | 14.1
BBB+ |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity, amortized cost, before allowance for credit loss | $ 20.4 | $ 20.5

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