XML 67 R55.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock compensation - RSU and PSU Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 31, 2016
Jan. 31, 2014
Jun. 30, 2018
Jun. 30, 2016
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) $ 100.5     $ 100.5    
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     322,593    
Outstanding (in shares) 1,043,697     1,043,697   769,202
Service period         3 years  
Unrecognized compensation            
Unrecognized compensation cost for nonvested option (in dollars) $ 53.9     $ 53.9    
Vesting period of recognition of the unrecognized compensation cost of nonvested awards       1 year 6 months    
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     133,333    
Performance Stock Units (PSUs)            
Stock Compensation Plans            
Granted (in shares) 446,500,000     446,500    
Unrecognized compensation            
Unrecognized compensation cost for nonvested option (in dollars) $ 26.7     $ 26.7    
Performance Stock Units (PSUs) | Maximum            
Stock Compensation Plans            
Service period 4 years          
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%