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Basis of Presentation Shares Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 29, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Aug. 01, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchased During the Period |  | 802,565 | 182,171 |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  | $ 50.0 |  |
Stock Repurchase Program, Authorized Amount |  | $ 49.5 |  | $ 275.0
Treasury Stock Acquired, Average Cost Per Share |  | $ 61.67 |  |
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchased During the Period | 528,100 |  |  |
Stock Repurchase Program, Authorized Amount | $ 36.0 |  |  |
Represents available for share repurchase | $ 65.4 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 68.26 |  |  |

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- Definition Represent number of shares that have been repurchased during the period under ASR program + References No definition available. + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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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 No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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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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