Represents the initial contractual term for share-based awards.

No definition available.

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- Definition

The aggregate fair value at grant date for nonvested equity-based awards issued during the period on other than stock options.

+ References

No definition available.

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- Definition

Stock Based Compensation Recognition of Cumulative Expense Not Previously Recognized

+ References

No definition available.

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- Definition

Stockholders' Equity [Line Items]

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Net number of share options (or share units) granted during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Stockholder's Equity and Share-Base Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2015	Oct. 31, 2015	Jul. 31, 2015	Jan. 31, 2015	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity [Line Items]
Share-based awards collectively available for grant	2,500,000					2,500,000	2,500,000
Number of share options granted							0
Restricted share awards granted							2,290,000
Total fair value of restricted shares granted	$ 113.1					$ 113.1	$ 113.1	$ 222.0	$ 75.0
Unrecognized compensation cost related to non-vested share-based awards	149.0					149.0	$ 149.0
Weighted average period of compensation costs							9 months
Shares issued in equity offering		10,000,000	18,400,000		24,800,000
Proceeds from issuance of common stock, net		$ 477.0	$ 971.0		$ 745.0
Stock Options
Stockholders' Equity [Line Items]
Total intrinsic value of options exercised							$ 7.9	$ 7.2	$ 6.8
Number of share options granted							0	0	0
Restricted Stock
Stockholders' Equity [Line Items]
Weighted average grant date fair values of awards							$ 52.09	$ 40.99	$ 36.92
Restricted Stock \| Executive Officer \| Annual Grant
Stockholders' Equity [Line Items]
Restricted share awards granted				800,000			100,000
Total fair value of restricted shares granted	$ 6.0			$ 33.9		6.0	$ 6.0
Restricted Stock \| Executive Officer \| Annual Grant \| Fiscal Year 2016
Stockholders' Equity [Line Items]
Restricted share awards granted	800,000
Total fair value of restricted shares granted	$ 40.0					40.0	$ 40.0
Performance Based Restricted Share Awards Annual Grant Executive Officer
Stockholders' Equity [Line Items]
Stock Based Compensation Recognition Of Cumulative Expense Not Previously Recognized						77.8
Performance Based Restricted Share Awards Annual Grant Executive Officer \| Executive Officer
Stockholders' Equity [Line Items]
Restricted share awards granted							600,000
Total fair value of restricted shares granted	$ 33.2					$ 33.2	$ 33.2
Restricted Stock With Common Stock Price Thresholds
Stockholders' Equity [Line Items]
Weighted average grant date fair values of awards							$ 52.05	$ 36.61	$ 22.53
Minimum \| Stock Options
Stockholders' Equity [Line Items]
Share-based awards explicit service period							3 years
Maximum \| Stock Options
Stockholders' Equity [Line Items]
Share-based awards explicit service period							4 years
Share-based awards contractual term							7 years
Maximum \| Restricted Stock
Stockholders' Equity [Line Items]
Share-based awards contractual term							7 years