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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Outstanding and nonvested as of December 31, 2019, Number of Shares |  |  | 1,833,000 |  |
Granted, Number of Shares |  |  | 1,893,000 |  |
Vested, Number of Shares |  |  | (317,000) |  |
Forfeited, Number of Shares |  |  | (71,000) |  |
Outstanding and nonvested as of March 31, 2020, Number of Shares | 3,338,000 |  | 3,338,000 |  | 1,833,000
Number of Shares, Expected to vest as of March 31, 2020 | 2,822,000 |  | 2,822,000 |  |
Outstanding and nonvested as of December 31, 2019, Weighted Average Grant Date Fair Value Per Share |  |  | $ 49.49 |  |
Granted, Weighted Average Grant Date Fair Value Per Share |  |  | 39.20 |  |
Vested, Weighted Average Grant Date Fair Value Per Share |  |  | 49.36 |  |
Forfeited, Weighted Average Grant Date Fair Value Per Share |  |  | 44.58 |  |
Outstanding and nonvested as of Mrach 31, 2020, Weighted Average Grant Date Fair Value Per Share | $ 43.77 |  | 43.77 |  | $ 49.49
Expected to vest as of March 31, 2020, Weighted Average Grant Date Fair Value Per Share | $ 43.13 |  | $ 43.13 |  |
SARs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Awards Outstanding, Beginning Balance |  |  | 7,001,000 |  |
Granted, Number of Awards | 0 | 0 | 0 | 0 |
Exercised, Number of Awards |  |  | (1,228,000) |  |
Forfeited, Number of Awards |  |  | (7,000) |  |
Number of Awards Outstanding, Ending Balance | 5,766,000 |  | 5,766,000 |  | 7,001,000
Number of Awards Exercisable, Ending Balance | 5,753,000 |  | 5,753,000 |  |
Number of Awards Vested and expected to vest, Ending Balance | 5,766,000 |  | 5,766,000 |  |
Weighted Average Exercise Price Per Award Outstanding, Beginning Balance |  |  | $ 27.85 |  |
Exercised, Weighted Average Exercise Price Per Award |  |  | 31.32 |  |
Forfeited, Weighted Average Exercise Price Per Award |  |  | 29.03 |  |
Weighted Average Exercise Price Per Award Outstanding, Ending Balance | $ 27.11 |  | 27.11 |  | $ 27.85
Exercisable, Weighted Average Exercise Price Per Award, Ending Balance | 27.10 |  | 27.10 |  |
Weighted Average Exercise Price Per Award, Vested and expected to vest, Ending Balance | $ 27.11 |  | $ 27.11 |  |
Weighted Average Remaining Contractual Term Outstanding |  |  | 4 years 9 months 18 days |  | 5 years 4 months 24 days
Exercisable Weighted Average Remaining Contractual Term |  |  | 4 years 9 months 18 days |  |
Weighted Average Remaining Contractual Term, Vested and expected to vest |  |  | 4 years 9 months 18 days |  |
Aggregate Intrinsic Value Outstanding | $ 103.0 |  | $ 103.0 |  | $ 138.7
Exercisable, Aggregate Intrinsic Value | 102.9 |  | 102.9 |  |
Aggregate Intrinsic Value, Vested and expected to vest | $ 103.0 |  | $ 103.0 |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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