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Stock Compensation Plans (Weighted Average Assumptions Used to Determine Fair Value of TSR PSUs) (Details) - TSR PSUs	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	0.85%
Dividend yield	0.00%
Volatility factor of the expected market price of the common shares	33.00%
Expected term (in years)	2 years 9 months 29 days	2 years 9 months 29 days
Correlation coefficient	43.00%

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Correlation Coefficient

+ References

No definition available.

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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

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-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=116856206&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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