| **Stock-Based and Other Long-Term Incentive Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions** | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------|----------------|
||
| Performance-based Restricted Stock Units                                                                                    |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Award vesting period                                                                                                        | 3 years        |
| Allocated share-based compensation expense | $                                                                              | $ 2.6          |
| Total shareholder return | $                                                                                                | 1.8            |
| Return on net capital employed | $                                                                                          | $ 0.8          |
| Time-based Restricted Stock Units                                                                                           |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Percentage of outstanding stock, minimum                                                                                    | 0.00%          |
| Percentage of outstanding stock, maximum                                                                                    | 200.00%        |
| The 2015 Plan | Restricted Stock Units                                                                                      |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Number of shares authorized (in shares)                                                                                     | 0.7            |
| Award vesting period                                                                                                        | 3 years        |
| The 2015 Plan | Restricted Stock Units | Executive Officer And Key Employees                                                |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Weighted average grant-date fair value (in dollars per share) | $ / shares                                                  | $ 7.68         |
| Shares available for grant (in shares)                                                                                      | 2.6            |
| The 2015 Plan | Restricted Stock | Executive Officer And Key Employees                                                      |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Equity-based compensation (in shares)                                                                                       | 0.1            |
| Weighted average grant-date fair value (in dollars per share) | $ / shares                                                  | $ 7.76         |
| The 2014 Director Plan | Restricted Stock Units | Executive Officer And Key Employees                                       |           |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                          |           |
| Shares available for grant (in shares)                                                                                      | 0.4            |

| X                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement by Share Based Payment Award, Percentage of Outstanding Stock Minimum
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| X                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-Based Payment Arrangement, Return on Net Capital Employed
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share-Based Payment Arrangement, Settlement Based On Total Shareholder Return
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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| - 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
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| - Definition
Number of shares authorized for issuance under share-based payment arrangement.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.
+ References
No definition available.
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