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Summary of Significant Accounting Policies, Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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ASU 2014-09 [Member] |  |
Accounting Pronouncements [Abstract] |  |
Cumulative impact on opening retained earnings |  | $ 13.0
ASU 2016-02 [Member] |  |
Accounting Pronouncements [Abstract] |  |
Cumulative impact on opening retained earnings | $ 0.7 |

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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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