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Stock-Based Compensation - Summary of unrecognized stock-based compensation expense (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total unrecognized stock-based compensation expense | $ 17.1
Weighted Average Remaining Vesting Period (Years) | 2 years 4 months 27 days
Performance-based Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total unrecognized stock-based compensation expense | 12.3
Weighted Average Remaining Vesting Period (Years) | 1 year 8 months 23 days
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total unrecognized stock-based compensation expense | 4.1
Weighted Average Remaining Vesting Period (Years) | 0 years 8 months 4 days
Restricted Stock Units And Deferred Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total unrecognized stock-based compensation expense | $ 0.7
Weighted Average Remaining Vesting Period (Years) | 0 years 9 months 29 days

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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