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Stockholders' Equity - RSU and PSU Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jul. 31, 2019
shares
Apr. 30, 2019
shares
Mar. 31, 2019
Jul. 31, 2018
shares
Jun. 30, 2018
shares
Jul. 31, 2016
Jan. 31, 2014
shares
Dec. 31, 2018
Jun. 30, 2016
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Stock Compensation Plans                          
Allocated Share-based Compensation Expense | $                     $ 166.6 $ 148.2 $ 133.1
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                   3 years 4 years    
Granted (in shares)           190,000         1,154,361    
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          
Performance Stock Units (PSUs)                          
Stock Compensation Plans                          
Vesting period   4 years     4 years                
Multiplier conversion rate of units into common stock (as a percent)                 83.00%   101.80%    
Granted (in shares)   86,975 100,000   77,243 446,500         233,467    
Performance Stock Units (PSUs) | Minimum                          
Stock Compensation Plans                          
Service period           3 years              
Performance Stock Units (PSUs) | Maximum                          
Stock Compensation Plans                          
Multiplier conversion rate of units into common stock (as a percent)   125.00%     150.00%                
Service period           4 years              
Performance Stock Units (PSUs) | Long term incentive plan                          
Stock Compensation Plans                          
Granted (in shares)     150,000     106,500              
Multiplying factor 100.00%     142.00%                  
Multiplying factor if performance condition not achieved     0.00%                    
Performance Stock Units (PSUs) | Long term incentive plan | Maximum                          
Stock Compensation Plans                          
Multiplying factor     100.00%     267.00%