Equity Incentive Programs (Schedule of Stock Option Activity Rollforward) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total future compensation expense	$ 15,800,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	0	$ 0	$ 0
Total future compensation expense	$ 0
Shares Under Option
Options exercisable (in shares)	1,532,033	1,702,866
Outstanding, beginning of year, Shares Under Option (in shares)	942,315
Granted, Shares Under Option (in shares)	0	0	0
Exercised, Shares Under Option (in shares)	0
Canceled/forfeited/expired, Shares Under Option (in shares)	(152,078)
Outstanding, end of year, Shares Under Option (in shares)	790,237	942,315
Weighted Average Exercise Price
Options exercisable (in dollars per share)	$ 23.60	$ 23.00
Outstanding, beginning of year, Weighted Average Exercise Price (in dollars per share)	24.31
Granted, Weighted Average Exercise Price (in dollars per share)	0
Exercised, Weighted Average Exercise Price (in dollars per share)	0
Canceled/forfeited/expired, Weighted Average Exercise Price (in dollars per share)	19.35
Outstanding, end of year, Weighted Average Exercise Price (in dollars per share)	$ 25.27	$ 24.31
Weighted Average Remaining Contractual Term (years)
Options exercisable	1 year 1 month 6 days	1 year 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 4 months	3 years 4 months
Aggregate Intrinsic Value (millions)
Options exercisable	$ 6,800,000	$ 12,300,000
Outstanding, Aggregate Intrinsic Value	$ 0	$ 0
Stock Options | Annual Anniversary Grant Date of Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration date	10 years
Stock Options | Termination for Death
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration date	24 months
Stock Options | Termination for Retirement or Disability
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration date	36 months
Stock Options | Employment Terminated, Any Other Reason
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration date	90 days
Stock Options | Vested in first year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	0.00%
Stock Options | Vested in second year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.33%
Stock Options | Vested in third year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.33%
Stock Options | Vested in fourth year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.34%