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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 1.0 | $ 0.1 | $ 2.5 | $ 1.9
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 3.9 | 0.2 | 9.7 | 4.7
Restricted Stock [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.0 | 0.1 | 0.0 | 0.1
Stock Compensation Plan [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 3.9 | 0.3 | 9.7 | 4.8
Total Shareholder Return [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.0 | 1.6 | 6.1 | 4.9
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 1.9 | $ (1.4) | $ 3.6 | $ (0.2)

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- 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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