| **Earnings Per Share (Details) - shares**                                            | 3 Months Ended | 6 Months Ended |
|--------------------------------------------------------------------------------------|----------------|----------------|
||
| **Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]**     |           |           |   |   |   |   |
| Common Stock, Shares, Outstanding                                                    | 99,100,000     |           | 104,600,000 |   | 99,100,000 | 104,600,000 |
| Stock Repurchased and Retired During Period, Shares                                  | 3,443,914      | 1,260,163      | 3,272,480 | 760,473 | 4,700,000 | 4,100,000 |
| Treasury Stock, Shares, Acquired                                                     |           |           |   |   | 500,000 | 600,000 |
| **Weighted Average Number of Shares Outstanding Reconciliation [Abstract]**          |           |           |   |   |   |   |
| Weighted-average number of common shares outstanding - basic                         | 101,300,000    |           | 106,100,000 |   | 101,800,000 | 106,400,000 |
| Weighted-average number of common shares outstanding - diluted                       | 102,200,000    |           | 108,000,000.0 |   | 103,300,000 | 109,000,000.0 |
| Potentially dilutive shares excluded from computation of dilutive earnings per share | 5,600,000      |           | 3,800,000 |   | 4,500,000 | 3,500,000 |
| Stock options                                                                        |           |           |   |   |   |   |
| **Weighted Average Number of Shares Outstanding Reconciliation [Abstract]**          |           |           |   |   |   |   |
| Incremental Common Shares Attributable to Share-based Payment Arrangements           | 300,000        |           | 1,100,000 |   | 400,000 | 1,200,000 |
| Restricted stock units                                                               |           |           |   |   |   |   |
| **Weighted Average Number of Shares Outstanding Reconciliation [Abstract]**          |           |           |   |   |   |   |
| Incremental Common Shares Attributable to Share-based Payment Arrangements           | 600,000        |           | 800,000 |   | 1,100,000 | 1,400,000 |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]
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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.
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| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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| - Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.
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| - Definition
Number of shares that have been repurchased and retired during the period.
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| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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