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Subsequent Events - Narrative (Details) $ in Millions |  | 6 Months Ended
--- | --- | ---
Aug. 01, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / €
Subsequent Event [Line Items] |  |
Exchange rate | $ / € |  | 1.17
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Lease termination | $ 8.0 |
Pro Forma | French Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |
Subsequent Event [Line Items] |  |
Disposal group, enterprise value |  | $ 246.0
Disposal group, equity value |  | 270.0
Pro Forma | French Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Minimum |  |
Subsequent Event [Line Items] |  |
Transaction and exit costs |  | 6.0
Tax expense |  | 18.0
Disposal group, gain |  | 182.0
Total cash available to US Shareholders tax-effected |  | 238.0
Pro Forma | French Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Maximum |  |
Subsequent Event [Line Items] |  |
Transaction and exit costs |  | 7.0
Disposal group, costs related to acceleration of vesting of employee restricted stock |  | 1.2
Tax expense |  | 24.0
Disposal group, gain |  | 188.0
Total cash available to US Shareholders tax-effected |  | $ 245.0

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- Definition Disposal Group, Including Discontinued Operation, Transaction And Exit Costs Related To Accelerated Vesting Of Employee Restricted Stock + References No definition available. + Details
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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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