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Share Incentive Plans, Compensation Expense Related to Options (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Compensation Expense [Abstract]        
Compensation expense related to options $ 0.3 $ 0.3 $ 0.8 $ 2.0
Unrecognized compensation expense related to options $ 1.0   $ 1.0  
Period over which unrecognized compensation expense will be expensed     1 year 11 months 23 days