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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.8	$ 0.9	$ 5.2	$ 6.3
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.5	0.7	2.1	2.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	34,359
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.3	1.2	4.3	4.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,311
Restricted stock units | Director [Member] | Fully Vested On The Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)			1.0	1.0
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.0	$ (1.0)	$ (1.2)	$ 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	20,618

X

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 718
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-Section S99
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