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Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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No definition available.

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Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Period of time over which TCJA transition tax on certain unrepatriated earnings of foreign subsidiaries may be paid.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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-Name Accounting Standards Codification
-Topic 740
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-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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Income Taxes - U.S. Tax Reform effects (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effect Of Tax Cuts And Jobs Act Of 2017, Accounting Incomplete, Provisional [Abstract]
Recognized one-time benefit, total	$ 11.6
Estimated benefit due to remeasurement of net deferred tax liabilities	19.4
Estimated expense on accumulated undistributed foreign earnings	$ 7.8
Scenario, Forecast [Member]
Effect Of Tax Cuts And Jobs Act Of 2017, Accounting Incomplete, Provisional [Abstract]
Tax payment period		8 years
Internal Revenue Service (IRS) [Member]
Effect Of Tax Cuts And Jobs Act Of 2017, Accounting Incomplete, Provisional [Abstract]
Statutory tax rate			35.00%		35.00%
Internal Revenue Service (IRS) [Member] \| Scenario, Forecast [Member]
Effect Of Tax Cuts And Jobs Act Of 2017, Accounting Incomplete, Provisional [Abstract]
Statutory tax rate		21.00%
Her Majesty's Revenue and Customs (HMRC) [Member]
Effect Of Tax Cuts And Jobs Act Of 2017, Accounting Incomplete, Provisional [Abstract]
Statutory tax rate			19.25%	20.00%