Equity Incentive Programs (Restricted Stock and Restricted Stock Unit Activity Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income from remeasurement of liabilities	$ 0.0	$ 0.3
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	$ 2.2	$ 2.1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs classified as liability	$ 0.5

Liability Awards, Remeasurement Gain (Loss)

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- Definition

Maximum Number of Days After Full Vesting for Dividends to be Paid

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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