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Compensation Plans (Restricted Stock Units) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 6.1	$ 6.3	$ 5.8
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued	95,000	68,000	172,000
Vesting period of compensation expense not yet recognized	2 years 3 months 18 days
Unrecognized compensation expense	$ 7.0
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	1.1
Unrecognized compensation expense	$ 5.7
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized	24 months
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized	26 months
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized		$ 1.0
Unrecognized compensation expense		$ 3.7
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized		24 months
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized		26 months
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized			$ 2.2
Unrecognized compensation expense			$ 8.1
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized			24 months
Restricted Stock Units (RSUs) [Member] | 2018 Grants [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of compensation expense not yet recognized			26 months

X

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

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