| **Stock-Based Compensation (Unrecognized Compensation Expense) (Details) (USD $)In Millions, unless otherwise specified** | 9 Months Ended           |
|---------------------------------------------------------------------------------------------------------------------------|--------------------------|
||
| Stock options                                                                                                             |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                        |                     |
| Unrecognized Compensation Expense                                                                                         | $ 5.5                    |
| Weighted Average Years Expense To Be Recognzed Over                                                                       | 2 years 0 months 24 days |
| Restricted stock units                                                                                                    |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                        |                     |
| Unrecognized Compensation Expense                                                                                         | 7.7                      |
| Weighted Average Years Expense To Be Recognzed Over                                                                       | 1 year 10 months 19 days |
| Performance stock units                                                                                                   |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                        |                     |
| Unrecognized Compensation Expense                                                                                         | $ 10.2                   |
| Weighted Average Years Expense To Be Recognzed Over                                                                       | 1 year 9 months 3 days   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |