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Earnings Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock options    
Anti-dilutive securities    
Dilutive securities excluded from the calculation of diluted earnings per share (in shares) 1,539,731 2,262,400
Restricted stock units    
Anti-dilutive securities    
Dilutive securities excluded from the calculation of diluted earnings per share (in shares) 671,854 57,834
Performance share units    
Anti-dilutive securities    
Dilutive securities excluded from the calculation of diluted earnings per share (in shares) 416,820 267,498
Convertible senior notes    
Anti-dilutive securities    
Dilutive securities excluded from the calculation of diluted earnings per share (in shares)   4,925,134