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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Company's effective tax rate	21.50%	23.20%	21.70%	22.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 1.4		$ 2.7
Reasonable possible increase in unrecognized tax benefits during the next twelve months	11.8		11.8
Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate	1.5		2.6
Unrecognized Tax Benefits, Interest on Income Taxes Expense	(0.1)		0.3
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 8.3		$ 8.3		$ 8.0

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Increase In Unrecognized Tax Benefits That Would Impact Effective Tax Rate.

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

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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 interest expense accrued for an underpayment of income taxes.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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