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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income taxes (benefit) expense | $ 45.8 | $ 46.2 | $ 70.8 | $ 85.3
Effective income tax rate | 28.50% | 37.70% | 30.60% | 33.00%
Total amount of unrecognized tax benefits, including related interest and penalties | $ 59.4 |  | $ 59.4 |
Unrecognized tax benefits excluding interest and penalties that if recognized would affect the effective tax rate | 39.1 |  | 39.1 |
Total accrued interest for tax contingencies | 9.6 |  | 9.6 |
Total accrued penalties for tax contingencies | 1.7 |  | 1.7 |
Amount of unrecognized tax benefits that could decrease within the next 12 months | 7.3 |  | 7.3 |
Decrease in unrecognized tax benefits due to the settlement of audits or resolution of administrative or judicial proceedings | 2.1 |  | 2.1 |
Decrease in unrecognized tax benefits expiration of statute of limitations | $ 5.2 |  | $ 5.2 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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