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Stock-Based and Other Incentive Compensation - Stock Options (Details) - Stock Options - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Options (in shares) [Roll Forward] |  |  |
Options outstanding at the beginning of the period (in shares) | 1.6 |  |
Stock options granted (in shares) | 0.8 |  |
Stock options exercised (in shares) | (0.3) |  |
Stock options cancelled (in shares) | (0.3) |  |
Options outstanding at the end of the period (in shares) | 1.8 | 1.6 |
Options exercisable at the end of the period (in shares) | 0.7 |  |
Options expected to vest at the end of the period (in shares) | 1.1 |  |
Weighted Average Remaining Contract Term (Years) [Roll Forward] |  |  |
Options outstanding - weighted average remaining contract term (in years) | 7 years 5 months 18 days | 6 years 3 months 18 days |
Options exercisable - weighted average remaining contract term (in years) | 5 years 6 months 21 days |  |
Options expected to vest - weighted average remaining contract term (in years) | 8 years 8 months 31 days |  |
Weighted Average Exercise Price (in dollars per share) [Roll Forward] |  |  |
Weighted average exercise price of options outstanding, beginning of period (in usd per share) | $ 11.61 |  |
Options granted exercise price (in usd per share) | 12.76 |  |
Options exercised, exercise price (in usd per share) | 9.68 |  |
Options cancelled exercise price (in usd per share) | 14.52 |  |
Weighted average exercise price of options outstanding, end of period (in usd per share) | 12.04 | $ 11.61 |
Options exercisable at end of period (in usd per share) | 10.54 |  |
Options expected to vest after end of period (in usd per share) | $ 13.00 |  |
Aggregate Intrinsic Value [Roll Forward] |  |  |
Aggregate intrinsic value of options outstanding, beginning of period (in dollars) | $ 4.0 |  |
Aggregate intrinsic value of options exercised (in dollars) | 1.2 | $ 0.6 |
Aggregate intrinsic value of options outstanding end of period (in dollars) | 0.1 | $ 4.0 |
Options Exercisable - aggregate intrinsic value (in dollars) | 0.1 |  |
Options expected to vest - aggregate intrinsic value (in dollars) | $ 0.0 |  |
Assumptions: |  |  |
Expected volatility (as a percent) | 52.00% | 57.00% | 60.00%
Risk-free interest rate (as a percent) | 1.70% | 2.30% | 2.20%
Dividend yield (as a percent) | 0.00% | 0.00% | 0.00%
Expected life (in years) | 6 years | 6 years | 6 years
Stock-based compensation, additional disclosures |  |  |
Grants, weighted average grant date fair value (in usd per share) | $ 6.40 | $ 7.69 | $ 10.16
Stock-based compensation expense recognized | $ 2.2 | $ 2.2 | $ 2.0
Tax benefit recognized related to stock based compensation expenses | 0.8 | $ 0.8 | $ 0.7
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized | $ 5.6 |  |
Weighted-average period of amortization | 2 years |  |
Cash received from exercise of stock options | $ 3.0 |  |

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