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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units      
Unrecognized compensation      
Unrecognized compensation cost related to unvested awards (in dollars) $ 12.6    
Cash-settled restricted stock units      
Unrecognized compensation      
Payments for vested cash-settled shares $ 0.6 $ 0.5 $ 1.3
Restricted Stock Shares, Restricted Stock Units and Performance Units      
Unrecognized compensation      
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 1 year 9 months 18 days