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Share-Based Compensation and Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Share-Based Compensation |  |
Upon vesting, each restricted stock unit and performance share replaced with common stock | 1.00% |
Stock based compensation expense | $ 8.0 | $ 10.4
Employee severance related costs | 7.9 |
Forfeiture credit | $ 4.5 |
Common stock repurchased (in shares) | 1,496,648 | 427,869
Common stock repurchased, value | $ 84.6 | $ 25.2
Payment of income tax obligation on employee equity awards | $ 9.3 | $ 13.6
Restricted stock units |  |
Share-Based Compensation |  |
Granted (in dollars per share) | $ 48.73 |
Restricted stock units | Long Term Incentive Plan 2010 |  |
Share-Based Compensation |  |
Granted (in shares) | 104,120 |
Vesting period | 3 years |
Performance stock units | Long Term Incentive Plan 2010 |  |
Share-Based Compensation |  |
Granted (in shares) | 87,864 |
Vesting period | 3 years |
Performance stock units | Minimum | Long Term Incentive Plan 2010 |  |
Share-Based Compensation |  |
Percentage number of performance shares awarded | 0.00% |
Performance stock units | Maximum | Long Term Incentive Plan 2010 |  |
Share-Based Compensation |  |
Percentage number of performance shares awarded | 200.00% |
Director |  |
Share-Based Compensation |  |
Granted (in shares) | 18,576 |
Granted (in dollars per share) | $ 48.45 |

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