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Earnings Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items] |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 94,500,000 |  | 97,200,000 |  |  | 94,500,000 | 97,200,000
Stock Repurchased and Retired During Period, Shares | 0 | 2,690,292 | 2,258,645 | 3,443,904 | 1,260,163 | 2,700,000 | 7,000,000.0
Treasury Stock, Shares, Acquired |  |  |  |  |  | 200,000 | 500,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |
Weighted-average number of common shares outstanding - basic | 94,500,000 |  | 97,600,000 |  |  | 95,000,000.0 | 100,400,000
Weighted-average number of common shares outstanding - diluted | 95,600,000 |  | 98,900,000 |  |  | 96,200,000 | 101,900,000
Potentially dilutive shares excluded from computation of dilutive earnings per share | 8,000,000.0 |  | 5,000,000.0 |  |  | 7,500,000 | 4,700,000
Stock options |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 0 |  | 400,000 |  |  | 100,000 | 400,000
Restricted stock units |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 1,100,000 |  | 900,000 |  |  | 1,100,000 | 1,100,000

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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://www.xbrl.org/2003/role/disclosureRef -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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1707-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1500-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1757-109256 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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