Date shares become exercisable

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- Definition

The number of shares already issued for awards.

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Awards Granted

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Number Of Shares Expected To Be Issued

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- Definition

Shares transferred to employee term, years.

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- Definition

Stock Options Granted For Term

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No definition available.

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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 FASB
-Name Accounting Standards Codification
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-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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.

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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
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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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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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- Definition

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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- Definition

Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended		12 Months Ended
	May 09, 2016	Feb. 15, 2016	May 31, 2016	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted for term, years						10 years
Date shares become exercisable						1 year
Shares transferred to employee term, years						3 years
Percentage of target number of performance shares to be earned					100.00%
Total stock compensation cost					$ 11.1	$ 8.2	$ 8.1
Weighted average period over which cost is expected to be recognized					1 year 4 months 24 days
Weighted average grant date fair value of stock options granted						$ 16.72	$ 17.35
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares transferred to employee term, years					3 years
Total compensation cost related to non-vested awards					$ 15.6
Aggregate intrinsic value					15.7
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period						3 years	3 years
Grant date fair value								$ 5.9	$ 4.5	$ 4.4
Total compensation cost related to non-vested awards					15.6
Aggregate intrinsic value					$ 21.3
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum common shares that may be issued for awards					9,585,055
Number of common shares that have been issued for awards					6,386,050
Stock Incentive Plan \| Non-Executive Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares that have been issued for awards					19,842
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price per share					$ 113.15
Aggregate intrinsic value for stock options outstanding					$ 10.6
Aggregate intrinsic value for stock options exercisable					$ 10.6
LTI Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years	3 years
LTI Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			0.00%	0.00%
LTI Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			200.00%	200.00%
LTI Program \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			50.00%	50.00%
LTI Program \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards granted			50.00%	50.00%
Grant date fair value	$ 0.2	$ 6.9
LTI Program \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards granted			50.00%	50.00%
Grant date fair value	$ 0.2	$ 7.0