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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Taxes [Line Items] |  |
Income taxes (benefit) expense | $ 28.4 | $ 47.6
Effective income tax rate | 25.00% | 33.20%
Total amount of unrecognized tax benefits, including related interest and penalties | $ 67.5 |
Unrecognized tax benefits excluding interest and penalties that if recognized would affect the effective tax rate | 48.9 |
Total accrued interest for tax contingencies | 10.3 |
Total accrued penalties for tax contingencies | 2.2 |
Amount of unrecognized tax benefits that could decrease within the next 12 months | 11.5 |
Decrease in unrecognized tax benefits due to the settlement of audits or resolution of administrative or judicial proceedings | 4.7 |
Decrease in unrecognized tax benefits expiration of statute of limitations | 6.8 |
Accounting Standards Update 2016-09 [Member] |  |
Income Taxes [Line Items] |  |
Excess tax benefits included in discrete events | $ 4.3 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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