| **Stock-Based Compensation (Unrecognized Compensation Expense) (Details) $ in Millions** | 6 Months Ended           |
|------------------------------------------------------------------------------------------|--------------------------|
||
| Stock options                                                                            |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**       |                     |
| Unrecognized Compensation Expense                                                        | $ 5.0                    |
| Weighted Average Years Expense To Be Recognized Over                                     | 2 years 2 months 12 days |
| Restricted stock units                                                                   |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**       |                     |
| Unrecognized Compensation Expense                                                        | $ 8.0                    |
| Weighted Average Years Expense To Be Recognized Over                                     | 2 years 2 months 12 days |
| Performance stock units                                                                  |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**       |                     |
| Unrecognized Compensation Expense                                                        | $ 8.3                    |
| Weighted Average Years Expense To Be Recognized Over                                     | 2 years 2 months 12 days |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
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