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Summary of Significant Accounting Policies, Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 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 |  |
ASU 2018-02 [Member] |  |  |
Accounting Pronouncements [Abstract] |  |  |
Cumulative impact on opening retained earnings |  | $ 1.7 |

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