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Stockholders' Equity - RSU and PSU Narrative (Details) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Jul. 31, 2019 shares | Apr. 30, 2019 shares | Mar. 31, 2019 | Jul. 31, 2018 shares | Jun. 30, 2018 shares | Jul. 31, 2016 | Jan. 31, 2014 shares | Dec. 31, 2018 | Jun. 30, 2016 | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  |  |  |  |  |  |  |  | $ 166.6 | $ 148.2 | $ 133.1
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  | 3 years |  |  |
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 |  |  |  |  | 1,154,361 |  |
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 |  |  |  |  |
Performance Stock Units (PSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  | 4 years |  |  |  |  |  |  |  |
Multiplier conversion rate of units into common stock (as a percent) |  |  |  |  |  |  |  |  | 83.00% |  | 101.80% |  |
Granted (in shares) |  | 86,975 | 100,000 |  | 77,243 | 446,500 |  |  |  |  | 233,467 |  |
Performance Stock Units (PSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Multiplier conversion rate of units into common stock (as a percent) |  | 125.00% |  |  | 150.00% |  |  |  |  |  |  |  |
Service period |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 150,000 |  |  | 106,500 |  |  |  |  |  |  |
Multiplying factor | 100.00% |  |  | 142.00% |  |  |  |  |  |  |  |  |
Multiplying factor if performance condition not achieved |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  | 100.00% |  |  | 267.00% |  |  |  |  |  |  |

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