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Summary of Significant Accounting Policies - Payroll Tax Credit (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) | Apr. 30, 2018 EUR (€) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Mar. 31, 2016 USD ($) | Mar. 31, 2016 EUR (€) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
CICE payroll tax credit |  |  |  |  |  |  | 6.00% | 7.00% | 6.00% | 6.00% | 6.00% | 4.00%
Multiplier for payroll tax credits |  |  |  |  |  |  | 2.5 |  |  |  |  |
Payment period |  |  |  |  |  |  | 3 years |  |  |  |  |
Net proceeds | $ 234.5 | € 190.9 | $ 143.5 | € 133.0 | $ 143.1 | € 129.9 |  |  |  |  |  |

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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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- References No definition available. + Details
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- Definition Amount of cash inflow from the sale of receivables classified as other. + 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=98514028&loc=d3e3179-108585 + Details
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