Employee Stock and Incentive Plans - Stock-Based Compensation (Details) shares in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
shares
| |
| Performance Shares [Member] | |
| Stock-based Compensation [Line Items] | |
| Vesting Period (Years) | 3 years |
| Restricted Stock Units [Member] | |
| Stock-based Compensation [Line Items] | |
| Vesting Period (Years) | 3 years |
| Employee Stock Purchase Plan (ESPP) [Member] | |
| Stock-based Compensation [Line Items] | |
| ESPP Discount | 5.00% |
| Executive Long-Term Incentive Compensation Plan [Member] | |
| Stock-based Compensation [Line Items] | |
| Common Stock Reserved (Shares) | 0.8 |
| Shares Available for Issuance | 0.7 |