Represent nncome tax reconciliation due to change it indefinite reinvestment assertion.

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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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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 (Detail Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended			12 Months Ended
Income Taxes (Detail Textuals) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Discrete tax expense (benefit)			$ 2.9
One-time transition tax benefit for deemed repatriation of the earnings						$ (0.2)
Impact of the one-time transition tax for the deemed repatriation of the earnings	$ 0.3
Tax expense related to change in indefinite reinvestment assertion to reflect deferred income taxes on any unremitted earnings			2.4
Tax expense related to excess tax deductions for stock-based compensation			1.5		$ 1.2
Tax expense related to changes in permanent reinvestment assertions			4.7
Tax benefit related to the release of uncertain tax positions due to settlement of audits and statute of limitations			12.4
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					$ (9.8)
United Kingdom
Income Taxes [Line Items]
U.K. statutory income tax rate		20.00%	19.00%	19.00%		19.25%
2017
Income Taxes [Line Items]
Effective income tax rate			35.00%
2018
Income Taxes [Line Items]
Effective income tax rate			21.00%