Summary of Significant Accounting Policies (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation
Total stock-based compensation	$ 9.4	$ 6.6	$ 7.8
Estimated forfeiture rate (as a percent)	5.10%	7.00%	5.70%
Stock options
Stock-Based Compensation
Total stock-based compensation	6.7	5.3	6.5
Risk-free interest rate, minimum (as a percent)	1.78%	1.07%	0.91%
Risk-free interest rate, maximum (as a percent)	2.10%	2.45%	1.78%
Expected life		6 years 6 months	6 years 6 months
Volatility (as a percent)		54.90%	55.90%
Volatility, minimum (as a percent)	53.07%
Volatility, maximum (as a percent)	56.24%
Stock options \| Minimum
Stock-Based Compensation
Vesting period	3 years
Expected life	6 years
Stock options \| Maximum
Stock-Based Compensation
Vesting period	5 years
Expected life	6 years 3 months
Restricted stock
Stock-Based Compensation
Total stock-based compensation	$ 2.7	$ 1.3	$ 1.3

Represents the estimated forfeiture rate used for calculating stock-based compensation.

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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

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The estimated measure of the 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.

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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.

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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.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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