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Summary of Significant Accounting Policies - Payroll Tax Credit (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 USD ($) | Jul. 31, 2015 EUR (€) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 EUR (€) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |  |  |  |  |  |
Multiplier for payroll tax credits |  |  |  |  | 2.5 |  |
Percentage of eligible wages for tax credit |  |  |  |  |  | 6.00% | 4.00%
Payment period |  |  |  |  | 3 years |  |
Net proceeds from sale of tax credits | $ 132.8 | € 120.1 | $ 104.0 | € 75.8 |  |  |

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- Definition Percentage to be applied to the eligible wages for calculation of the CICE payroll tax credit. + References No definition available. + Details
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- Definition Multiplier to the French minimum wage for the purpose of determining eligibility for the French payroll tax credit. Credit d'Impot pur la Competitive et l'Emploi ("CICE"), French legislation, provides payroll tax credit on a percentage of wages paid to employees receiving less than this number times the French minimum wage. + References No definition available. + Details
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- Definition The carry-forward period after which the remaining CICE payroll tax credit will be paid. + References No definition available. + Details
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- Definition The cash inflow associated with the sale of other receivables not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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