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Share-Based Compensation and Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Share-Based Compensation |  |  |
Upon vesting, each restricted stock unit and performance share replaced with common stock |  | 1.00% |
Stock based compensation expense |  | $ 5.9 | $ 8.0
Employee severance related costs |  | 7.9 |
Forfeiture credit |  | $ 4.5 |
Common stock repurchased (in shares) | 0 | 385,606 | 1,496,648
Common stock repurchased, value |  | $ 20.0 | $ 84.6
Payment of income tax obligation on employee equity awards | $ 0.0 | $ 6.2 | $ 9.3
Restricted stock units |  |  |
Share-Based Compensation |  |  |
Granted (in dollars per share) |  | $ 61.45 |
Restricted stock units | Long Term Incentive Plan 2010 |  |  |
Share-Based Compensation |  |  |
Granted (in shares) |  | 82,505 |
Vesting period |  | 3 years |
Performance stock units | Long Term Incentive Plan 2010 |  |  |
Share-Based Compensation |  |  |
Granted (in shares) |  | 69,132 |
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) |  | 14,643 |
Granted (in dollars per share) |  | $ 61.45 |

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