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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 1.0 | $ 0.6 | $ 1.8 | $ 1.6
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.5 | 2.3 | 4.9 | 6.0
Restricted Stock [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.1 | 0.0 | 0.1 | 0.1
Stock Compensation Plan [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.6 | 2.3 | 5.0 | 6.1
Less: Amount paid by unconsolidated affiliates | 0.2 | 0.7 | 0.5 | 1.9
Net compensation expense | $ 2.4 | 1.6 | $ 4.5 | 4.2
Common Stock |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 172 |  | 80,953 |
Restricted Stock [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation | 91 |  | 1,070 |
Total Shareholder Return [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 1.9 | 1.9 | $ 3.8 | 3.9
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 0.6 | $ 0.4 | $ 1.1 | $ 2.1

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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