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Stock compensation - RSU and PSU Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jul. 31, 2016
Jan. 31, 2014
Jun. 30, 2016
Sep. 30, 2018
Dec. 31, 2017
Stock Compensation Plans              
Assumed annualized forfeiture rate (as a percent)           5.00%  
Stock Options              
Stock Compensation Plans              
Vesting period     4 years   3 years    
Unrecognized compensation              
Unrecognized compensation cost for nonvested option (in dollars)           $ 117.8  
Vesting period of recognition of the unrecognized compensation cost of nonvested awards           1 year 7 months 6 days  
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       867,197  
Outstanding (in shares)           472,995 769,202
Service period         3 years    
Unrecognized compensation              
Unrecognized compensation cost for nonvested option (in dollars)           $ 73.0  
Vesting period of recognition of the unrecognized compensation cost of nonvested awards           1 year 9 months 18 days  
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)           266,667  
Outstanding (in shares)           133,333  
Performance Stock Units (PSUs)              
Stock Compensation Plans              
Vesting period 4 years            
Granted (in shares) 77,243 446,500,000       523,743  
Unrecognized compensation              
Unrecognized compensation cost for nonvested option (in dollars)           $ 29.3  
Performance Stock Units (PSUs) | Maximum              
Stock Compensation Plans              
Service period   4 years          
Multiplying factor 150.00%            
Performance Stock Units (PSUs) | Minimum              
Stock Compensation Plans              
Service period   3 years          
Performance Stock Units (PSUs) | Long term incentive plan              
Stock Compensation Plans              
Granted (in shares)   106,500,000          
Performance Stock Units (PSUs) | Long term incentive plan | Maximum              
Stock Compensation Plans              
Multiplying factor   267.00%