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Stockholders’ Equity - RSU and PSU Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Jul. 31, 2018
shares
Jun. 30, 2018
shares
Jul. 31, 2016
Jan. 31, 2014
shares
Dec. 31, 2018
shares
Jun. 30, 2016
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2014
shares
Dec. 31, 2018
shares
Stock Compensation Plans                      
Allocated Share-based Compensation Expense | $             $ 148.2 $ 133.1 $ 96.2    
Outstanding (in shares)         545,751   545,751 769,202     545,751
Stock Options                      
Stock Compensation Plans                      
Vesting period     4 years     3 years          
Assumed annualized forfeiture rate (as a percent)             5.00%        
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           3 years 4 years        
Granted (in shares)   190,000         898,598        
Assumed annualized forfeiture rate (as a percent)             5.00%        
Restricted Stock Units (RSUs) | President And Chief Executive Officer                      
Stock Compensation Plans                      
Granted (in shares)       400,000              
Number of units vesting at the end of each of the calendar years 2014 through 2019       0.1667              
Vested (in shares)                     266,667
Outstanding (in shares)         133,333   133,333       133,333
Performance Stock Units (PSUs)                      
Stock Compensation Plans                      
Vesting period 4 years                    
Allocated Share-based Compensation Expense | $                 $ 0.0    
Multiplier conversion rate of units into common stock (as a percent)         83.00%       100.00%    
Granted (in shares) 77,243 446,500         523,743 0 0 55,326  
Assumed annualized forfeiture rate (as a percent)             5.00%        
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) 150.00%                    
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%