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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 | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Apr. 30, 2019 | Jul. 31, 2018 | Jun. 30, 2018 | Jul. 31, 2016 | Jan. 31, 2014 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  | $ 43.4 | $ 38.0 |  | $ 124.6 | $ 110.8 |
Assumed annualized forfeiture rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% |  |
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 |  |  |  |  |  | 1,132,673 |  |
Service period |  |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | President And Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units vesting at the end of each calendar year (as a percent) |  |  |  |  |  |  |  |  |  | 16.70% |  |
Granted (in shares) |  |  |  |  |  | 400,000 |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  | 333,334 |  |
Outstanding (in shares) |  |  |  |  |  |  | 66,666 |  |  | 66,666 |  |
Performance Stock Units (PSUs) |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 100,000 | 77,243 | 446,500 |  |  |  |  |  | 231,915 |  |
Multiplying factor |  |  |  |  |  |  |  |  |  |  |  | 83.00%
Performance Stock Units (PSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  | 3 years |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  | 4 years |  |  |  |  |  |  |  |
Multiplying factor |  |  | 150.00% |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 106,500 |  |  |  |  |  |  |  |
Multiplying factor | 142.00% |  |  |  |  |  |  |  |  |  |  |
Performance Stock Units (PSUs) | Long term incentive plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |
Multiplying factor |  |  |  | 267.00% |  |  |  |  |  |  |  |

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