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Earnings Per Share - Share-based Compensation (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based awards, exercised or released (in shares) | 35,722 | 395,648 | 1,372,679 | 1,158,943
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 6,953 | 18,546 | 27,794 | 245,847
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 28,769 | 184,176 | 1,002,003 | 362,573
Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 0 | 192,926 | 342,882 | 550,523

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