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Earnings Per Share - Additional Information (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Employee Stock Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from the calculation of diluted EPS (shares) 0.2 0.3 0.5 0.3