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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
ERP Systems, Useful Life | 10 |  |
Leasehold Improvements, Useful Life | the shorter of the useful life or the remaining lease term |  |
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test | 11 |  |
Foreign Currency Transaction pre-tax Gain (Loss) | $ 2.1 | $ 2.0 | $ (1.4)
Minimum |  |  |
Furniture and Equipment, Useful Life | 3 years |  |
Buildings, Useful Life | 10 years |  |
Other Internal Use Software, Useful Life | 3 |  |
Finite-Lived Intangible Assets, Useful Life | 7 years |  |
Maximum |  |  |
Furniture and Equipment, Useful Life | 7 years |  |
Buildings, Useful Life | 35 years |  |
Other Internal Use Software, Useful Life | 7 |  |
Finite-Lived Intangible Assets, Useful Life | 15 years |  |

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