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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock-Based Compensation Activity
Income tax benefit	$ 0.8	$ 1.0	$ 1.5	$ 1.8
Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	3.1	2.4	5.8	4.5
Restricted Stock [Member]
Stock-Based Compensation Activity
Compensation expense	0.0	0.0	0.0	0.0
Stock Compensation Plan [Member]
Stock-Based Compensation Activity
Compensation expense	3.1	2.4	5.8	4.5
Total Shareholder Return [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	2.1	1.8	4.1	3.3
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	$ 1.0	$ 0.6	$ 1.7	$ 1.2

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
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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- Definition

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