| **Common Stock Stock Repurchase (Details) - Subsequent Event [Member] - USD ($) $ in Millions** | Dec. 31, 2020  | Apr. 30, 2019 |
|-------------------------------------------------------------------------------------------------|----------------|---------------|
| **Subsequent Event [Line Items]**                                                               |           |          |
| Stock Repurchase Program, Authorized Amount                                                     |           | $ 200         |
| Stock Repurchase Program Expiration Date                                                        | Dec. 31,  2020 |          |

| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
+ References
No definition available.
+ Details**Name:**us-gaap_StockRepurchaseProgramAuthorizedAmount1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.
+ References
No definition available.
+ Details**Name:**us-gaap_StockRepurchaseProgramExpirationDate**Namespace Prefix:**us-gaap_**Data Type:**xbrli:dateItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.
+ References
No definition available.
+ Details**Name:**us-gaap_SubsequentEventLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |