Share-Based Compensation - Weighted Average Assumptions and Fair Values Used for Employee Stock Options and Restricted Stock Units (Details) - Equity Incentive Plan - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Weighted average expected term of options - in years	4 years 10 months 4 days	4 years 10 months 15 days	4 years 10 months 2 days
Weighted average expected volatility of the Company's underlying common stock	34.70%	33.70%	31.70%
Risk-free interest rate	2.82%	1.81%	1.32%
Expected dividend yield	$ 0	$ 0	$ 0
Weighted average grant date fair value - stock options (usd per share)	$ 105.81	$ 57.81	$ 31.17
Weighted average grant date fair value - restricted stock units (usd per share)	$ 294.50	$ 181.23	$ 100.35

Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]

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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

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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