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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Outstanding interest-bearing obligations $ 33.0 $ 34.9
Level 2 | Estimated fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Outstanding interest-bearing obligations $ 33.9 $ 35.2