Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
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| Income Tax Disclosure [Abstract] | ||
| Income taxes (benefit) expense | $ 39.1 | $ 9.4 |
| Effective income tax rate | 28.90% | 10.30% |
| Excess tax benefits on share-based compensation included in discrete events | $ 2.4 | $ 19.4 |
| Total amount of unrecognized tax benefits, including related interest and penalties | 67.0 | |
| Unrecognized tax benefits excluding interest and penalties that if recognized would affect the effective tax rate | 45.8 | |
| Total accrued interest for tax contingencies | 10.2 | |
| Total accrued penalties for tax contingencies | 1.8 | |
| Amount of unrecognized tax benefits that could decrease within the next 12 months | 2.8 | |
| Decrease in unrecognized tax benefits due to the settlement of audits or resolution of administrative or judicial proceedings | 0.5 | |
| Decrease in unrecognized tax benefits expiration of statute of limitations | $ 2.3 | |
| Effective tax rate applied | 21.00% | |
| X | ||||||||||
- Definition Estimated decrease in unrecognized tax benefits within the next twelve months due to settlement of audits or resolution of administrative or judicial proceedings. No definition available.
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| X | ||||||||||
- Definition Estimated decrease in unrecognized tax benefits within the next twelve months due to expiration of statute of limitations. No definition available.
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| X | ||||||||||
- Definition Excess tax benefits. No definition available.
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- Definition Gross balance of unrecognized tax benefits including interest and penalties. No definition available.
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of interest expense accrued for an underpayment of income taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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