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Fair Value - Debt Portfolio (Details) - Unsecured Senior Notes - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument
Total principal outstanding	$ 305.0	$ 305.0
Level 2 inputs
Debt Instrument
Fair value of debt	$ 321.1	$ 316.9

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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