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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards Outstanding, Beginning Balance | 12,076 |
Granted, Awards | 1,400 |
Exercised, Awards | (1,126) |
Forfeited, Awards | (352) |
Awards Outstanding, Ending Balance | 11,998 | 12,076
Exercisable Awards, Ending Balance | 7,136 |
Weighted Average Exercise Price Outstanding, Beginning Balance | $ 38.70 |
Granted, Weighted Average Exercise Price | 62.21 |
Exercised, Weighted Average Exercise Price | 33.63 |
Forfeited, Weighted Average Exercise Price | 52.29 |
Weighted Average Exercise Price Outstanding, Ending Balance | 41.52 | $ 38.70
Exercisable, Weighted Average Exercise Price, Ending Balance | $ 38.80 |
Weighted Average Remaining Contractual Term Outstanding | 6 years | 6 years 7 months 6 days
Exercisable Weighted Average Remaining Contractual Term | 4 years 6 months |
Aggregate Intrinsic Value Outstanding, Beginning balance | $ 216.4 |
Aggregate Intrinsic Value Outstanding, Ending balance | 148.7 | $ 216.4
Exercisable, Aggregate Intrinsic Value, Ending Balance | $ 106.8 |
Incentive Plan and Independent Directors Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding and nonvested at December 31, 2015, Shares | 34 |
Granted, Shares | 27 |
Vested, Shares | (35) |
Outstanding and nonvested at December 31, 2016, Shares | 26 | 34
Outstanding and nonvested at December 31, 2015, Weighted Average Grant Date Fair Value | $ 51.08 |
Granted, Weighted Average Grant Date Fair Value | 62.30 |
Vested, Weighted Average Grant Date Fair Value | 51.37 |
Outstanding and nonvested at December 31, 2016, Weighted Average Grant Date Fair Value | $ 62.35 | $ 51.08

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- Definition Share-based compensation arrangement by share-based payment award options and appreciation rights exercisable weighted average exercise price. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award options and appreciation rights exercises in period. + References No definition available. + Details
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- Definition The number of grants made 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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