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Equity (Share Repurchase Program) (Details) - USD ($) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jan. 31, 2020 | Nov. 30, 2019 | Jun. 30, 2019 | Feb. 28, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |
Share repurchase program, authorized amount |  | $ 250,000,000 | $ 200,000,000 | $ 200,000,000 | $ 200,000,000
Treasury stock acquired (in shares) | 2,130,509 |  |  |  |
Treasury stock acquired, average price per share (in USD per share) | $ 55.06 |  |  |  |
Shares cancelled (in shares) | 3,000,000 |  |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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