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Income Taxes - Narrative (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]          
Net tax provision   $ 307.5 $ 330.5 $ 95.6  
Income taxes payments, net   $ 155.0 161.7 125.8  
Increase in effective tax rate due to GILTI provision, percent   1.00%      
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change In tax rate, deferred tax asset, provisional income tax expense $ 41.1 $ 1.6      
Tax Cuts And Jobs Act Of 2017, incomplete accounting, Transition Tax, for accumulated foreign earnings, provisional income tax expense $ 290.0        
Tax Cuts And Jobs Act Of 2017, Transition Tax   $ 222.0      
Increase in effective tax rate after Transition Tax, percent   48.50%      
Foreign net operating losses   $ 202.1      
State net operating loss carry forwards   2.2      
State tax credits   9.8      
Increase in valuation allowance   29.2      
Unremitted foreign earnings   4,700.0      
Increase in unrecognized tax benefit during the year   142.1 51.7    
Decrease in income tax provision if unrecognized tax benefits were recognized   332.5      
Interest and penalties   18.2 14.8 12.0  
Tax penalties     4.5 3.7  
Change in interest and penalties in tax accruals for uncertainties     4.0 5.6  
Unrecognized tax benefits   356.4 $ 214.3 $ 162.6 $ 131.3
Minimum          
Income Tax Contingency [Line Items]          
Reduction in unrecognized tax benefit in the next 12 months   $ 0.0      
Period subject to examination for income tax return   3 years      
Statute of limitation period for income tax return in foreign jurisdictions   3 years      
Maximum          
Income Tax Contingency [Line Items]          
Reduction in unrecognized tax benefit in the next 12 months   $ 2.5      
Period subject to examination for income tax return   5 years      
Statute of limitation period for income tax return in foreign jurisdictions   5 years      
Federal          
Income Tax Contingency [Line Items]          
Tax credit carryforwards amount   $ 0.6      
State And Local Jurisdiction          
Income Tax Contingency [Line Items]          
State net operating loss carry forwards   659.1      
Tax credit carryforwards amount   $ 12.4      
State And Local Jurisdiction | Minimum          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expirations, years   1 year      
State And Local Jurisdiction | Maximum          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expirations, years   20 years      
State And Local Jurisdiction | Over One          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expirations, years   1 year      
State And Local Jurisdiction | 20          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expirations, years   20 years      
Foreign Country          
Income Tax Contingency [Line Items]          
Foreign net operating loss carryforwards   $ 915.6