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Equity Incentive Programs (Restricted Stock and Restricted Stock Unit Activity Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Income from remeasurement of liabilities $ 0.0 $ (0.4) $ 0.2 $ 0.2
Restricted Stock and Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of days dividends will be paid after vesting, maximum     45 days  
Award vesting period     3 years  
Compensation expense 2.6 $ 3.5 $ 7.4 $ 10.9
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs classified as liability $ 0.4   $ 0.4