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Equity Incentive Programs (Schedule of Restricted Stock and Restricted Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Weighted- Average Grant Date Fair Value Per Share    
RSU liability awards income $ 0.0 $ (0.1)
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  
Weighted- Average Grant Date Fair Value Per Share    
Compensation expense recognized $ 5.4 $ 9.7
Restricted Stock    
Shares    
Nonvested at beginning of year, (in shares) 2,961,750  
Granted, Units (in shares) 1,233,610  
Vested (in shares) (576,524)  
Forfeited, Units (in shares) (565,817)  
Nonvested at end of year, (in shares) 3,053,019 2,961,750
Weighted- Average Grant Date Fair Value Per Share    
Nonvested, beginning of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 11.55  
Granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 3.88  
Vested, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 22.55  
Forfeited, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 8.26  
Nonvested, end of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 6.99 $ 11.55
Nonvested, Weighted- Average Remaining Contractual Term (Years) 1 year 2 months 12 days 1 year 3 months 18 days
Restricted Stock Units (RSUs)    
Shares    
Nonvested at beginning of year, (in shares) 249,538  
Granted, Units (in shares) 44,016  
Vested (in shares) (24,742)  
Forfeited, Units (in shares) (46,719)  
Nonvested at end of year, (in shares) 222,093 249,538
Weighted- Average Grant Date Fair Value Per Share    
Nonvested, beginning of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 11.70  
Granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 3.80  
Vested, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 17.93  
Forfeited, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) 7.11  
Nonvested, end of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share) $ 10.41 $ 11.70
Nonvested, Weighted- Average Remaining Contractual Term (Years) 6 months 1 year 3 months 18 days
Equity instruments other than options, fair value $ 0.5