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Fair Value Measurements (Details 1) - Senior Notes Due 2023 - Senior Notes - USD ($) $ in Millions | Apr. 29, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of notes |  | $ 307.1 | $ 1,060.0
Subsequent Event |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of notes | $ 499.5 |  |

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- Definition Fair value portion of notes payable. + 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 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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