Allocated share-based compensation expense after tax.

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Maximum units awarded based upon measurement.

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Minimum units awarded based upon measurement.

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Range of ultimate number of restricted stock units awarded.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Award Remaining Vesting Percentage

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award Allocation Percentage

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- Definition

Sharebased compensation arrangement by sharebased payment award granted percentage

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No definition available.

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- Definition

Weighted-average remaining life of unvested restricted stock units.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(ii)
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

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No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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-SubTopic 10
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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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-Name Accounting Standards Codification
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Capital Stock - Additional Information 1 (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended					12 Months Ended
	Jan. 31, 2016	Feb. 28, 2015	Jan. 31, 2014	May. 31, 2013	Jan. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense						$ 100.0	$ 148.0	$ 136.0
Stock-based compensation expenses, after tax						65.0	95.0	94.0
Restricted stock, capitalized						$ 53.0	$ 62.0	55.0
Unvested restricted stock units						4,570,203
Weighted average grant date fair value per share						$ 61.65
Total Shareholder Return Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares outstanding						172,000	354,000
Compensation expense						$ 648,000.0	$ 18.0	27.0
Stock-based compensation expenses, after tax						418,000.0	11.0	17.0
Restricted stock, capitalized						267,000.0	$ 7.0	$ 13.0
Total compensation cost related to non-vested options not yet recognized						$ 4.7
Unvested restricted stock units						172,212
Weighted-average remaining life of unvested restricted stock units						1 year 9 months 18 days
Weighted average grant date fair value per share						$ 0
Conditional Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares outstanding						500,972
Compensation expense						$ 3.4
Stock-based compensation expenses, after tax						2.2
Restricted stock, capitalized						1.4
Total compensation cost related to non-vested options not yet recognized						$ 29.0
Weighted-average remaining life of unvested restricted stock units						2 years 4 months 24 days
2013 Total Shareholder Return Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial conditional restricted stock unit awards granted to eligible employees					1,232,176
Nonvested shares outstanding				918,016
Minimum units awarded based upon measurement						0
Maximum units awarded based upon measurement						216,434
Range of ultimate number of restricted stock units awarded						Zero and a maximum of 216,434 units
Restricted stock awards cancelled				918,016
Total awards, outstanding						108,217
2014 Total Shareholder Return Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial conditional restricted stock unit awards granted to eligible employees			157,406
Minimum units awarded based upon measurement						0
Maximum units awarded based upon measurement						127,990
Range of ultimate number of restricted stock units awarded						Zero and a maximum of 127,990 units
Total awards, outstanding						63,995
Performance Program 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial conditional restricted stock unit awards granted to eligible employees		602,304
Minimum units awarded based upon measurement						0
Maximum units awarded based upon measurement						751,458
Range of ultimate number of restricted stock units awarded						Zero and a maximum of 751,458 shares
Total awards, outstanding						500,972
Performance Program 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum units awarded based upon measurement						0
Maximum units awarded based upon measurement						1,710,526
Range of ultimate number of restricted stock units awarded						Zero to a maximum of 1,710,526 units
Weighted average grant date fair value per share						$ 36.55
Performance Program 2016 [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial conditional restricted stock unit awards granted to eligible employees	855,263
Total Shareholder Return Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares allocation percentage						50.00%
Business Performance Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares outstanding						501,000
Percentage of shares awarded						150.00%
Weighted average grant date fair value per share						$ 66.63
Business Performance Program [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares allocation percentage						50.00%
Remaining shares vesting percentage						50.00%
Shares vesting period						3 years
Business Performance Program [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares awarded						0.00%
Share-based Compensation Award, Tranche One [Member] \| Business Performance Program [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting percentage						50.00%