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Financial Statement Presentation - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 42.2
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other (income) expense | $ 2.6 | $ 0.8 | $ 1.6 | $ 1.4 |

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