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Summary of Significant Accounting Policies - Payroll Tax Credit (Details) € in Millions, $ in Millions	1 Months Ended						12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2016 USD ($)	Mar. 31, 2016 EUR (€)	Jul. 31, 2015 USD ($)	Jul. 31, 2015 EUR (€)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Multiplier for payroll tax credits							2.5
Payment period							3 years
Net proceeds from sale of tax credits	$ 143.5	€ 133.0	$ 143.1	€ 129.9	$ 132.8	€ 120.1
Tax Credit Carryforward [Line Items]
Percentage of eligible wages for tax credit							7.00%	6.00%	6.00%	6.00%	4.00%

X

- 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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X

- 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.

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- Definition

The carry-forward period after which the remaining CICE payroll tax credit will be paid.

+ References

No definition available.

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No definition available.

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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=66902209&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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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