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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%