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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 |  |  |

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