Equity Incentive Programs (Stock Options Narrative) (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	$ 10,700,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Options granted (in shares)	0	0
Compensation expense	$ 0	$ 0
Estimated future compensation expense	0
Proceeds from stock options exercised	$ 0	$ 0
Annual Anniversary Grant Date of Award \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earliest expiration period of award after event	10 years
Termination for Death \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earliest expiration period of award after event	24 months
Termination for Retirement or Disability \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earliest expiration period of award after event	36 months
Employment Terminated, Any Other Reason \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earliest expiration period of award after event	90 days
Vested in the first year \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	0.00%
Vested in the second year \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.33%
Vested in third year \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.33%
Vested in fourth year \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vested	33.33%

Share-based Compensation Arrangement by Share-based Payment Award, Earliest Expiration Period of Award After Event

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Gross number of share options (or share units) granted during the period.

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