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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 3.4	$ 4.0	$ 5.4	$ 7.2
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	0.8	0.5	1.3	1.0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.9	2.0	2.9	2.9
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	204,981
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.7	1.5	1.2	3.3
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	529,496
Fully Vested On The Grant Date | Director | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.0	$ 1.0	$ 1.0	$ 1.0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	119,925

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Net number of non-option equity instruments granted to participants.

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