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Stock compensation - RSU and PSU (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2018
Jun. 30, 2018
Jul. 31, 2016
Jan. 31, 2014
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2016
Dec. 31, 2018
Stock Compensation Plans                        
Allocated Share-based Compensation Expense                 $ 42.5 $ 40.6    
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     379,496      
Service period                     3 years  
Performance Stock Units (PSUs)                        
Stock Compensation Plans                        
Vesting period     4 years   4 years              
Multiplier conversion rate of units into common stock (as a percent)         150.00%              
Granted (in shares)     86,975   77,243 446,500            
Multiplying factor 101.80%                     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     125.00%                  
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%