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Fair Value Measurements - Credit Ratings (Details) $ in Millions | Jun. 30, 2020 USD ($)
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | $ 72.3
Standard & Poor's, AA+ Rating |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | 13.5
Standard & Poor's, AA Rating |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | 10.7
Standard & Poor's, A Rating |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | 24.2
Standard & Poor's, A- Rating |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | 13.4
Standard & Poor's, BBB+ Rating |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Debt securities, held-to-maturity | $ 10.5

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