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Stock-Based Compensation Expense - Schedule of Assumptions Used to Value Options Granted (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee stock purchase plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] |  |  |
Expected life (in years) | 2 years | 2 years | 2 years
Employee stock purchase plan | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] |  |  |
Risk-free interest rate | 0.10% | 1.70% | 2.20%
Dividend yield | 1.40% | 3.50% | 3.60%
Expected volatility | 45.80% | 51.70% | 39.40%
Employee stock purchase plan | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] |  |  |
Risk-free interest rate | 1.40% | 2.50% | 2.70%
Dividend yield | 4.00% | 5.40% | 3.90%
Expected volatility | 57.50% | 53.40% | 41.70%
Performance Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract] |  |  |
Expected life (in years) | 3 years |  |
Risk-free interest rate | 0.20% |  |
Dividend yield | 1.40% |  |
Expected volatility | 51.30% |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References 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)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References 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)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 + Details
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