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Fair Value Measurements - Credit Ratings (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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