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Stock compensation - RSU and PSU Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jul. 31, 2016
Jan. 31, 2014
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2016
Dec. 31, 2018
Stock Compensation Plans                
Allocated Share-based Compensation Expense         $ 40.6 $ 36.2    
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)   190,000,000     165,251      
Outstanding (in shares)         401,040     545,751
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      
Performance Stock Units (PSUs)                
Stock Compensation Plans                
Vesting period 4 years              
Multiplier conversion rate of units into common stock (as a percent) 150.00%              
Granted (in shares) 77,243 446,500,000            
Multiplying factor               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            
Performance Stock Units (PSUs) | Long term incentive plan                
Stock Compensation Plans                
Granted (in shares)   106,500            
Performance Stock Units (PSUs) | Long term incentive plan | Maximum                
Stock Compensation Plans                
Multiplier conversion rate of units into common stock (as a percent)   267.00%