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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense Benefit [Line Items]        
Earnings (losses) before income taxes, foreign   $ 99.5 $ 5.6 $ (52.1)
Interest expense, foreign deposits   64.2 110.7 107.0
Interest expense, domestic deposits   64.2 110.7 $ 107.0
Net unrecognized tax benefits   9.0 10.0  
Accrued interest and penalties related to unrecognized tax benefits   2.9 2.8  
Deferred tax liabilities   332.0 371.1  
Undistributed earnings of foreign subsidiaries   $ 330.0 243.0  
Unrecognized deferred tax liability on undistributed earnings     $ 15.6  
Federal statutory rate   35.00% 35.00% 35.00%
Deferred income taxes   $ 905.1 $ 796.5  
U.S. repatriation tax rate   9.70%    
U.S. repatriation tax amount   $ 36.8    
Noncurrent Liabilities [Member]        
Income Tax Expense Benefit [Line Items]        
Deferred tax liabilities   332.0 $ 371.1  
Deferred minimum tax credits   108.2    
General Business Tax Credits [Member]        
Income Tax Expense Benefit [Line Items]        
Deferred tax credits   $ 571.6    
Deferred tax credits expiration year   2034    
State Tax Credits [Member]        
Income Tax Expense Benefit [Line Items]        
Deferred tax credits   $ 3.5    
Deferred tax credits expiration year   2021    
HR One [Member]        
Income Tax Expense Benefit [Line Items]        
Deferred income taxes   $ 1.0    
U.S. repatriation tax rate   10.00%    
U.S. repatriation tax amount   $ 40.0    
Scenario, Forecast [Member]        
Income Tax Expense Benefit [Line Items]        
Federal statutory rate 21.00%