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Summary of Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other long-term assets | $ 25.0 | $ 23.4
Long-term debt | $ (596.4) | (595.6)
Accounting Standards Update 2015-03 | Reclassification |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other long-term assets |  | (3.1)
Long-term debt |  | $ 3.1

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