Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
U.S. federal income tax rate		21.00%	35.00%	35.00%
Tax cuts and jobs act of 2017 incomplete accounting transition tax for accumulated foreign earnings provisional income tax expense (benefit)	$ 24.0	$ 24.0
Impact of GILTI on effective tax rate		(1.70%)
Net operating loss carry-forwards	283.0	$ 283.0
Net operating loss carry-forwards with have no expiration date	266.0	$ 266.0
Net Operating loss carry-forwards, expiration date		2029
Tax credit carry-forwards	9.0	$ 9.0
Tax credit carry-forwards, expiration date		2026
Tax benefit due to reversal of valuation allowance		$ 37.0
Effective income tax rate		38.40%	25.80%	28.60%
Unrecognized tax benefits related to prior years			$ 34.6
Unrecognized accrued interest and penalties	6.6	$ 6.6	$ 6.3
Net increase to income tax reserves for unrecognized tax benefits based on tax positions related to current and prior years		4.2
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	54.4	54.4
Current Tax Payable Part of Other Current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	4.0	4.0
Non-Current Tax Payable Part of Other Non-current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	50.4	$ 50.4
Minimum
Income Taxes [Line Items]
Effective income tax rate		20.00%
Maximum
Income Taxes [Line Items]
Effective income tax rate		30.00%
Non-US Foreign Tax Credit Carryforwards
Income Taxes [Line Items]
Tax credit carry-forwards	$ 7.0	$ 7.0
Tax credit carry-forwards, expiration date		2022