Subsequent Events Accelerated Share Repurchases (Details) - Subsequent Event [Member] |
1 Months Ended | ||
|---|---|---|---|
Oct. 02, 2018 |
Mar. 31, 2019 |
Feb. 28, 2019 |
|
| Accelerated Share Repurchases [Line Items] | |||
| Accelerated Share Repurchase, Date Entered | Oct. 02, 2018 | ||
| Minimum [Member] | |||
| Accelerated Share Repurchases [Line Items] | |||
| Accelerated Share Repurchase, Completion Date | 2/1/2019 | ||
| Maximum [Member] | |||
| Accelerated Share Repurchases [Line Items] | |||
| Accelerated Share Repurchase, Completion Date | 3/1/2019 | ||