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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Expense (Details) - Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Unrecognized compensation  
Unrecognized compensation cost related to unvested awards (in dollars) $ 20.0
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 2 years