Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Tax Cuts and Jobs Act of 2017, provisional income tax expense		$ 19.8
Tax Cuts and Jobs Act of 2017, provisional transition tax		18.0
Tax Cuts and Jobs Act of 2017, income tax expense related to remeasurement of deferred tax assets and liabilities		1.8
Tax Cuts and Jobs Act of 2017, differences of Non-U.S. subsidiaries offset by foreign tax credits	$ 7.8
Discontinued operation, tax effect of discontinued operation				$ 0.3	$ 0.6
Deferred income tax expense (benefit), discontinued operation					0.5
Net operating loss carryforwards		35.1	$ 35.1
Net operating loss carryforwards, expiration term (at least)			6 years
Change in valuation allowance			$ 0.7
Recognized tax benefits		5.5	5.5	4.3
Liability for interest expense and penalties accrued		$ 2.2	2.2	1.5
International
Segment Reporting Information [Line Items]
Charges associated with exit taxes			$ 2.5	$ 6.5	$ 7.7