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Stockholders’ Equity - RSU and PSU Narrative (Details) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended | 60 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2018 shares | Jun. 30, 2018 shares | Jul. 31, 2016 | Jan. 31, 2014 shares | Dec. 31, 2018 shares | Jun. 30, 2016 | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2014 shares | Dec. 31, 2018 shares
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  |  |  |  | $ 148.2 | $ 133.1 | $ 96.2 |  |
Outstanding (in shares) |  |  |  |  | 545,751 |  | 545,751 | 769,202 |  |  | 545,751
Stock Options |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  | 3 years |  |  |  |  |
Assumed annualized forfeiture rate (as a percent) |  |  |  |  |  |  | 5.00% |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded for each RSU (in shares) |  |  |  |  |  |  | 1 |  |  |  |
Percentage of units vesting at the end of each calendar year (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |
Vesting period |  |  |  |  |  | 3 years | 4 years |  |  |  |
Granted (in shares) |  | 190,000 |  |  |  |  | 898,598 |  |  |  |
Assumed annualized forfeiture rate (as a percent) |  |  |  |  |  |  | 5.00% |  |  |  |
Restricted Stock Units (RSUs) | President And Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 400,000 |  |  |  |  |  |  |
Number of units vesting at the end of each of the calendar years 2014 through 2019 |  |  |  | 0.1667 |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  | 266,667
Outstanding (in shares) |  |  |  |  | 133,333 |  | 133,333 |  |  |  | 133,333
Performance Stock Units (PSUs) |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  |  |  |  |  |  | $ 0.0 |  |
Multiplier conversion rate of units into common stock (as a percent) |  |  |  |  | 83.00% |  |  |  | 100.00% |  |
Granted (in shares) | 77,243 | 446,500 |  |  |  |  | 523,743 | 0 | 0 | 55,326 |
Assumed annualized forfeiture rate (as a percent) |  |  |  |  |  |  | 5.00% |  |  |  |
Performance Stock Units (PSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |  |  |
Multiplier conversion rate of units into common stock (as a percent) | 150.00% |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 106,500 |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan | Maximum |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |
Multiplier conversion rate of units into common stock (as a percent) |  | 267.00% |  |  |  |  |  |  |  |  |

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