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Stock compensation - RSU and PSU (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Apr. 30, 2019 | Jul. 31, 2018 | Jun. 30, 2018 | Jul. 31, 2016 | Jan. 31, 2014 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2016 | Sep. 30, 2020 | Sep. 30, 2019
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  | $ 43.8 |  | $ 43.4 |  |  |  | $ 132.6 | $ 124.6
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 |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 190,000 |  |  |  |  |  |  |  |  | 1,313,820 |
Service period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Performance Stock Units (PSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 92,347 | 86,975 |  | 77,243 | 446,500 |  |  |  |  |  |  |  |  | 92,347 |
Multiplying factor |  |  |  |  |  |  |  |  | 101.80% |  |  | 83.00% |  |  |
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) | 200.00% | 125.00% |  | 150.00% |  |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan - 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 100,000 |  | 106,500 |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  |  |  |  |  |  |  |  | 142.00% |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan - 1 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  |  | 267.00% |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan - 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan - 2 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan - 2 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |

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