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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements |  |  |
Increase in valuation allowance | $ (8.4) | $ 14.7 | $ 13.6
Accounting Standards Update 2016-09 |  |  |
New Accounting Pronouncements |  |  |
Deferred tax assets related to federal and state net operating losses | 0.2 |  |
Increase in valuation allowance | $ 0.2 |  |

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