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Equity Incentive Plan RSUs and PSUs Rollforward (Details) - $ / shares
$ / shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]    
Restricted Stock Units, Nonvested, Intrinsic Value $ 32.5 $ 27.8
Performance Stock Units, Grants in Period 4,505  
Performance Share Unit, Nonvested, Number of Shares 17,183 12,814
Performance Share units, Nonvested, Intrinsic Value $ 13.6 $ 7.2
Share Based Compensation, Performance Shares Vested in the Period 0  
Share Based Compensation, Performance Shares Forfeited in the period (136)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Restricted Stock Units, Nonvested, Number, Beginning 49,252  
Restricted Stock Units, Grants in Period 11,750  
Restricted Stock Units, Vested in Period (16,948)  
Restricted Stock Units, Forfeited in Period (3,069)  
Restricted Stock Units, Nonvested, Number, Ending 40,985