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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax [Line Items]      
Federal corporate tax 21.00% 35.00% 35.00%
Tax benefit due to effect of reducing the statutory tax rate   $ 1,500.0  
Deferred tax due to tax reform $ 17.6    
Accumulated unremitted earnings 5,500.0    
Income (loss) from continuing operations before income taxes, foreign 52.0 966.0 $ 350.0
Operating loss carryforwards 1,300.0    
Deferred tax assets, valuation allowance 195.0 293.0  
Valuation allowance, deferred tax asset, change in amount   30.5  
Increase in unrecognized tax benefits is reasonably possible 66.7    
Unrecognized tax benefits that would impact effective tax rate 444.0 365.0  
Unrecognized tax benefits, income tax penalties and interest expense 8.0 8.3  
Not Subject To Expiration [Member]      
Income Tax [Line Items]      
Operating loss carryforwards 886.0    
Subject To Expiration [Member]      
Income Tax [Line Items]      
Operating loss carryforwards 438.0    
Indefinite Re - Investment [Member]      
Income Tax [Line Items]      
Unremitted earnings 1,900.0    
U.S. Federal NOL's [Member]      
Income Tax [Line Items]      
Operating loss carryforwards subject to varying limitations 296.0    
Operating loss carryforwards excluded from statement of financial condition 189.0    
Operating loss carryforwards utilized in the current year 31.0    
Operations Deferred Tax Asset Deemed Realizable [Member]      
Income Tax [Line Items]      
Valuation allowance, deferred tax asset, change in amount 98.0    
Operations Deferred Tax Asset Deemed Realizable [Member] | Germany [Member]      
Income Tax [Line Items]      
Valuation allowance, deferred tax asset, change in amount   $ 35.2  
Operations Deferred Tax Asset Deemed Realizable [Member] | FRANCE      
Income Tax [Line Items]      
Valuation allowance, deferred tax asset, change in amount $ 64.2    
Minimum [Member]      
Income Tax [Line Items]      
Operating loss carryforwards, expiration date Jan. 01, 2019    
Maximum [Member]      
Income Tax [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2038