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Income Taxes - Summary of Changes in Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits beginning balance	$ 463.0	$ 385.3	$ 379.0
Increases (decreases):
Increases in tax positions for prior years	35.3	35.9	26.0
Decreases in tax positions for prior years	(30.9)	(20.6)	(12.3)
Increase in tax positions for the current period	83.5	115.0	34.5
Purchase accounting adjustments (See Footnote 1 and Footnote 8)	(8.8)	0.0	0.0
Currency translation adjustments	0.4	0.0	0.0
Settlements with taxing authorities	(1.7)	(6.2)	0.0
Lapse of statute of limitations	(66.4)	(46.4)	(41.9)
Unrecognized tax benefits ending balance	$ 474.4	$ 463.0	$ 385.3

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Amount of unrecognized tax benefits.

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