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Employee Share Plans - Stock Award Activity (Detail) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares
Compensation And Retirement Disclosure [Abstract] |
Outstanding Beginning balance, Number of Options | shares | 3,622
Exercised, Number of Options | shares | (1,210)
Outstanding Ending balance, Number of Options | shares | 2,412
Vested and exercisable Ending balance, Number of Options | shares | 1,456
Outstanding Beginning balance, Weighted Average Exercise Price Per Share | $ / shares | $ 11.97
Exercised, Weighted Average Exercise Price Per Share | $ / shares | 8.77
Outstanding Ending balance, Weighted Average Exercise Price Per Share | $ / shares | 13.58
Vested and exercisable Ending balance, Weighted Average Exercise Price Per Share | $ / shares | $ 11.54
Weighted Average Remaining Contractual Term, Outstanding | 2 years 9 months
Weighted Average Remaining Contractual Term, Vested and exercisable at December 31, 2019 | 2 years 1 month 17 days
Aggregate Intrinsic Value, Outstanding Ending Balance | $ | $ 32.3
Aggregate Intrinsic Value, Vested and exercisable at December 31, 2019 | $ | $ 22.4

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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