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Earnings Per Share (Details) - shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items] |  |  |
Common Stock, Shares, Outstanding | 94,400,000 | 102,500,000 |
Stock Repurchased and Retired During Period, Shares | 2,690,292 | 1,260,163 |
Treasury Stock, Shares, Acquired | 200,000 | 500,000 |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |
Weighted-average number of common shares outstanding - basic | 96,000,000.0 | 102,300,000 |
Weighted-average number of common shares outstanding - diluted | 97,500,000 | 102,300,000 | [1]
Potentially dilutive shares excluded from computation of dilutive earnings per share | 5,200,000 | 5,800,000 |
Stock options |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 200,000 | 0 |
Restricted stock units |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 1,300,000 | 0 |
[1] | (1) Due to the net loss during the three months ended March 31, 2019, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercise price, as it would result in a less dilutive computation. As a result, reported diluted earnings per share for the three months ended March 31, 2019 are the same as basic earnings per share.

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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