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Long-term Compensation Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award          
Total number of shares of common stock that may be subject to grant awards (in shares)         15,500,000
Awards outstanding (in shares)   4,833,766 3,890,643    
Awards granted (in shares) 2,400,000        
Fair value of awards granted $ 26.7        
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award          
Vested in period, fair value   $ 18.5 $ 9.9 $ 1.4  
Awards granted (in shares)   3,404,362 1,581,444 1,117,719  
The 2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award          
Awards granted (in shares)   3,453,247      
Awards outstanding (in shares)   4,833,766