Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Federal corporate tax	21.00%	21.00%	35.00%
Tax benefit due to effect of reducing the statutory tax rate		$ 1,500.0
Unremitted earnings	$ 5,400.0
Operating loss carryforwards	1,200.0
Operating loss carryforwards, not subject to expiration	871.0
Operating loss carryforwards, subject to expiration	355.0
Deferred Tax Assets, Valuation Allowance	270.5	195.0
Valuation allowance, deferred tax asset, change in amount	(52.7)
Unrecognized tax benefits that would impact effective tax rate	437.0	444.0	$ 365.0
Unrecognized tax benefits, income tax penalties and interest expense	10.6	8.0	$ 8.3
Undistributed Earnings of Foreign Subsidiaries	6,000.0
Deferred Tax Liabilities, Undistributed Foreign Earnings	10.8
Decrease in Unrecognized Tax Benefits is Reasonably Possible	66.0
Minimum
Income Tax [Line Items]
Potential income tax expense due to change in tax regulation	180.0
Maximum
Income Tax [Line Items]
Potential income tax expense due to change in tax regulation	220.0
Operations Deferred Tax Asset Deemed Realizable
Income Tax [Line Items]
Deferred Tax Assets, Valuation Allowance	271.0	195.0
Valuation allowance, deferred tax asset, change in amount	(75.5)	98.0
Operations Deferred Tax Asset Deemed Realizable | FRANCE
Income Tax [Line Items]
Valuation allowance, deferred tax asset, change in amount		$ 64.2
Domestic Tax Authority
Income Tax [Line Items]
Operating loss carryforwards	257.0
Operating loss carryforwards, subject to expiration	614.0
Operating loss carryforwards, subject to expiration, varying limitations	135.0
Operating loss carryforwards excluded from statement of financial condition	130.0
Operating loss carryforwards utilized in the current year	32.0
Foreign Tax Authority
Income Tax [Line Items]
Operating loss carryforwards	969.0
State Jurisdiction
Income Tax [Line Items]
Operating loss carryforwards	387.0
Operating loss carryforwards, subject to expiration	1,800.0
Operating loss carryforwards, subject to expiration, varying limitations	227.0
Operating loss carryforwards excluded from statement of financial condition	227.0
Operating loss carryforwards utilized in the current year	11.5
State Jurisdiction | Carryback 3 years, carryforward 5 years
Income Tax [Line Items]
Operating loss carryforwards, subject to expiration	185.0
State Jurisdiction | Five-year carryforward
Income Tax [Line Items]
Operating loss carryforwards, subject to expiration	$ 202.0