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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 |  |

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