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Basis of Presentation Shares Repurchases (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Aug. 01, 2017 | Aug. 19, 2016
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Shares Repurchases [Abstract] |  |  |
Stock Repurchased During the Period | 35,887 |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 20.0 |  |
Stock Repurchase Program, Authorized Amount |  | $ 275.0 | $ 125.0
Authorized Amount Increase Under Share Repurchase Program |  | $ 150.0 |

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- Definition Represent authorized amount increase under Share Repurchase Program + References No definition available. + Details
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- Definition Shares Repurchases [Abstract] + References No definition available. + Details
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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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Data Type: | xbrli:sharesItemType
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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://www.xbrl.org/2003/role/presentationRef -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 Amount of stock repurchase plan authorized. + References No definition available. + Details
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