Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative translation adjustments	$ (211.4)	$ (221.4)
Market value of derivative financial instruments, net of tax	(17.2)	(22.0)
Accumulated other comprehensive income (loss)	$ (228.6)	$ (243.4)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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