Income Taxes [Line Items]

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Tax cuts and jobs act of 2017, change in tax rate, income tax expense (benefit).

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Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense.

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- Definition

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

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Effective Income Tax Rate					21.00%			35.00%
Discrete tax expense (benefit)	$ (5.6)	$ 2.7			$ (2.8)
Tax Cuts and Jobs Act of 2017 (the "Act"), one-time transition tax on the mandatory deemed repatriation of foreign earnings			$ (0.2)
Tax expense related to excess tax deductions for stock-based compensation					1.8
Tax expense related to changes in permanent reinvestment assertions					2.3
Tax expense discrete on uncertain tax positions					(1.3)	$ 4.0
Tax benefit related to internal restructuring					$ (4.2)
Tax expense related to intra-entity sale of an asset						8.0
Tax benefit related to reversal interest on uncertain tax positions						$ 4.8
United Kingdom
Income Taxes [Line Items]
U.K. statutory income tax rate				20.00%	19.00%		19.00%	19.25%