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Summary of Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Discrete income tax benefit | $ 10.8 | $ 8.6 | $ 1.9
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Discrete income tax benefit | $ (7.9) |  |

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