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Stock-Based Compensation - Additional Information (Detail) shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) shares
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded | shares	1.4
Aggregate grant date fair value | $	$ 65.1
Time-Based RSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded | shares	0.5
Aggregate grant date fair value | $	$ 21.4

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- Definition

Share based compensation arrangement by share based payment award aggregate grant date fair value.

+ References

No definition available.

+ 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.

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- Definition

Net number of share options (or share units) granted during the 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)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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