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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 4.2	$ 2.5	$ 9.0	$ 3.4
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.6	0.8	2.3	1.6
Stock options granted in period (shares)	19,370
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.9	2.0	3.4	3.0
Equity instruments other than options granted in period (shares)	2,835
Restricted stock units | Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.2	0.2	1.0	1.0
Equity instruments other than options granted in period (shares)	83,167
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 2.7	$ (0.3)	$ 3.3	$ (1.2)
Equity instruments other than options granted in period (shares)	11,622

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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