Stock-Based Compensation - Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Options
Assumptions used to estimate the fair value of each option grant
Expected life (years)	6 years 6 months	6 years 6 months	6 years 6 months
Risk-free Interest rate (as a percent)	2.60%	2.80%	2.20%
Expected volatility (as a percent)	39.80%	43.70%	45.00%
Performance Shares
Assumptions used to estimate the fair value of each option grant
Correlation (as a percent)	32.50%	29.50%	31.60%
Risk-free Interest rate (as a percent)	2.50%	2.40%	1.50%
Expected volatility (as a percent)	47.00%	33.80%	35.00%

Share based compensation arrangement by share based payment award fair value assumptions correlation.

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No definition available.

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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

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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