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v3.20.1

Long-Term Debt (Details) - Subordinated Debt $ in Millions | Mar. 31, 2020 USD ($)
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3.25% Notes due 2030 |
Debt Instrument [Line Items] |
Debt instrument, face amount | $ 200.0
Debt instrument, interest rate (as a percent) | 3.25%
Debt instrument, effective rate (as a percent) | 3.35%
3.75% Notes due 2035 |
Debt Instrument [Line Items] |
Debt instrument, face amount | $ 175.0
Debt instrument, interest rate (as a percent) | 3.75%
Debt instrument, effective rate (as a percent) | 3.85%

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