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Stockholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock purchase plan | $ 100.0 |  |
Treasury stock purchase plan remaining available | $ 100.0 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 80,186 | 26,307 | 27,636
Payment, Tax Withholding, Share-based Payment Arrangement | $ 18.6 | $ 6.3 | $ 4.1
Treasury Stock, Common, Shares | 850 | 408 | 0

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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