Employee Service Share-based Compensation, Net Excess Tax Benefit from Compensation Expense

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Award Shares

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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.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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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).

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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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- 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

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).

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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.

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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.

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- Definition

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

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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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- Definition

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

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Stock compensation plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of common stock authorized to be issued under plan	5,300,000.0
Number of options granted (in shares)	155,498
Unrecognized compensation expense	$ 27.2
Shares available for future grants	3,578,241
Stock-based compensation	$ 22.4	$ 19.4	$ 16.9
Tax benefit from compensation expense	20.7	12.8	$ 5.5
Net excess tax benefit from compensation expense	$ 15.9	$ 6.6
Stock option granted, weighted average grant date fair value (in dollars per share)	$ 58.16	$ 39.70	$ 27.42
Stock option granted, weighted average grant date fair value	$ 69.4	$ 15.7	$ 11.3
Stock option expenses including selling general and administrative expenses	$ 9.1
Non-vested restricted stock units issued (in shares)	62,221	82,865	93,367
Non vested restricted stock expense including selling general and administrative expense	$ 13.3
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 9.1
Period for recognition	1 year 8 months 12 days
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options granted (in shares)	155,498
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	62,221
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 16.5
Period for recognition	1 year 9 months 18 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	62,221
Weighted average grant date fair value (in dollars per share)	$ 250.66	$ 187.85	$ 142.71
Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 284.33
2014 Plan \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1
2014 Plan \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1.8
Prior Plans Before December 31, 2013 \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1
Prior Plans Before December 31, 2013 \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1.8
Prior Plans After January 1, 2014 \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1
Prior Plans After January 1, 2014 \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares	1.8
Minimum \| Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	8,915
Maximum \| Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	22,290