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Leases (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accumulated deficit | $ (633.4) | $ (656.3) | $ (656.8)
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accumulated deficit |  | $ 0.5 |

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