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Employee Stock Plans - Stock Option Valuation Assumptions (Details) - $ / shares

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Share-based Payment Arrangement [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate

^[1]

24.00%

24.00%

24.00%

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term

^[2]

5 years 7 months 6 days

5 years 7 months 6 days

5 years 6 months

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate

^[3]

1.40%

2.50%

2.70%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

$ 20.59

$ 22.68

$ 23.12

[1]	Volatility is measured using historical daily price changes of the company's common stock over the expected term of the option.
[2]	The expected term represents the weighted-average period the option is expected to be outstanding and is based primarily on the historical exercise behavior of employees.
[3]	The risk-free interest rate is based on the U.S. Treasury zero-coupon yield with a maturity that approximates the expected term of the option.

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

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-Name Accounting Standards Codification
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-SubTopic 10
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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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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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