XML 64 R47.htm IDEA: XBRL DOCUMENT v3.22.0.1
Summary of Significant Accounting Policies and Other Items - Employee Benefit Plans (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounting Policies [Abstract]      
Employer match of first tier of employee contribution (as a percent) 100    
First tier percentage of compensation eligible for match 3    
Employer match of second tier of employee contribution (as a percent) 50    
Second tier percentage of compensation eligible for match 4    
Employer matching contributions $ 1.2 $ 1.6 $ 3.1
Employer non-elective contribution $ 0.0 $ 0.0 $ 0.1