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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Level 2 [Member] | Senior Unsecured Notes [Member] |  |
Other Fair Value Measurements |  |
Senior unsecured notes | $ 326.7 | $ 302.9

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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