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Equity Incentive Program Equity Incentive Program - PSUs (Details) - Performance Shares [Member]
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
numberOfGrantees
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares     766,466 920,973
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     293,874  
Vested (1) | shares     (346,898)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares     (101,483)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares     $ 21.28 $ 16.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     28.49  
Vested (1) | $ / shares     14.13  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares     $ 19.05  
Unrecognized compensation expense | $     $ 10.0  
Weighted average period for compensation expense to be recognized     1 year 2 months 12 days  
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Incremental Increase of Initial Grant Value, Percentage     0.00%  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Incremental Increase of Initial Grant Value, Percentage     225.00%  
2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected 3.9 9    
2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected 2.4 8    
2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected 4.7 8