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Stock-Based Compensation - Components of stock-based compensation expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) | $ 7.6 | $ 1.3 | $ 11.6 | $ 5.4
Accelerated amortization | $ 4.0 |  | $ 4.0 |
Fair value assumptions and methodology |  |  |  |
Expected volatility range of stock, minimum (as a percent) | 35.10% | 58.30% | 35.10% | 58.30%
Expected volatility range of stock, maximum (as a percent) | 35.40% | 66.50% | 36.20% | 66.50%
Expected life of option, range in years, minimum | 3 years | 2 years | 3 years | 2 years
Expected life of option, range in years, maximum | 5 years | 4 years | 5 years | 4 years
Risk-free interest range rate, minimum (as a percent) | 1.00% | 0.40% | 1.00% | 0.40%
Risk-free interest range rate, maximum (as a percent) | 1.50% | 1.20% | 1.50% | 1.20%
Expected dividend yield on stock, minimum (as a percent) | 0.00% | 0.60% | 0.00% | 0.60%
Expected dividend yield on stock, maximum (as a percent) | 0.00% | 0.70% | 0.00% | 0.70%
PRSU expense (benefit) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) | $ 5.4 | $ (0.9) | $ 7.4 | $ 0.2
Option expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) | 2.0 | 1.7 | 3.5 | 3.4
RSU/DSU expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) | $ 0.2 | 0.5 | 0.7 | 1.8
PRSU and Option expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) |  |  | $ 0.5 |
PRSU after re-evaluation |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense (benefit) |  | $ (3.0) |  | $ (3.0)

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- Definition Maximum expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Minimum expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The maximum estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References No definition available. + Details
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- Definition The estimated minimum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References No definition available. + Details
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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 Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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