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Earnings Per Share - Share-based Compensation (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based awards, exercised or released (in shares) | 522,358 | 80,843 | 1,336,957 | 763,295
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 7,093 | 73,583 | 20,841 | 227,301
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 515,265 | 7,260 | 973,234 | 178,397
Performance Share Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options exercised (in shares) | 0 | 0 | 342,882 | 357,597

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