Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Tax benefits recognized for net operating loss carryforwards		$ 4.3	$ 1.2	$ 0.6
U.S. statutory income tax rate		35.00%	35.00%	35.00%
Provisional amount of deferred tax benefits due to the Tax Act		$ 304.0
Provisional amount of tax expense due to the Tax Act		130.6
Foreign earnings included in domestic taxable income			$ 180.4	$ 249.7
Foreign earnings included in domestic taxable income, domestic taxes			7.1	12.2
Net operating loss carryforwards		399.4
Deferred tax asset related to operating loss carryforwards		94.6
Valuation allowance		$ 118.6	64.5
Carryforward description		The carryforward periods range from three years to indefinite, subject to certain limitations under applicable laws.
Cash paid for income taxes		$ 661.4	499.4	879.7
Unrecognized tax benefits		22.9	17.3	19.1	$ 12.0
Unrecognized tax benefits that, if recognized, would affect the effective tax rate		16.8	13.9	9.9
Income related to interest		0.2	1.9	1.9
Accrued interest expense and penalties		1.1	$ 0.9	$ 2.8
Unrecognized tax benefits, resulting primarily from intercompany transactions		$ 1.8
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Tax year remain subject to examination		2009
Tax examinations		The United States Internal Revenue Service has completed examinations of the Company’s tax returns for all years through 2012, with the exception of 2009 which remains subject to examination.
Net Operating Loss Carryforwards
Income Taxes [Line Items]
Valuation allowance		$ 78.3
Minimum
Income Taxes [Line Items]
Operating loss carryforwards periods		3 years
Foreign
Income Taxes [Line Items]
Net operating loss carryforwards		$ 271.3
United States
Income Taxes [Line Items]
Net operating loss carryforwards		$ 128.1
Other Major Jurisdictions | Earliest Tax Year
Income Taxes [Line Items]
Tax year remain subject to examination		2008
Other Major Jurisdictions | Latest Tax Year
Income Taxes [Line Items]
Tax year remain subject to examination		2017
Scenario Forecast
Income Taxes [Line Items]
U.S. statutory income tax rate	21.00%