Stock Plans and Share-Based Compensation - Weighted Average Assumptions Used for Performance Units (Details) - Performance Units	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Weighted-Average Assumptions Used:
Risk-free Interest Rate	0.20%	0.20%	1.40%
Annualized Volatility	34.30%	33.60%	24.50%
Expected Life (in years)	2 years 7 months 6 days	2 years 10 months 24 days	2 years 10 months 24 days

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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