Income Taxes - Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Other non-current assets	$ 29.6	$ 26.2
Deferred tax liabilities	104.4	105.9
Total deferred tax liabilities	$ 74.8	$ 79.7

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant