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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	28.70%	11.20%	38.30%	17.70%
Unrecognized tax benefits	$ 12.1		$ 12.1		$ 9.5
Unrecognized tax benefits if recognized that would affect effective tax rate	11.0		11.0		8.4
Accrued interest related to uncertain tax positions	1.1		1.1		$ 0.9
Unrecognized tax benefits subject to change within the next 12 months	$ 6.2		$ 6.2

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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