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Share-Based Compensation and Other Compensation Matters (Percentile Grant and Assumptions) (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2020
Performance-based PIUs |  |  |  |
Potential earned payout for defined levels of performance under awards |  |  |  |
Earned payout (as a percent of PSUs/ PIUs granted) on 75th or greater percentile rank |  |  |  | 100.00%
Earned payout (as a percent of PSUs/ PIUs granted) on 50th percentile rank (target) |  |  |  | 50.00%
Earned payout (as a percent of PSUs/ PIUs granted) on 25th percentile rank |  |  |  | 25.00%
Performance share units/ PB PIUs granted on percentile rank below 25th (as a percent) |  |  |  | 0.00%
Performance-based PIUs | 2019 PB PIU |  |  |  |
Assumptions used to value stock awards |  |  |  |
Grant date fair value (in dollars per share) |  | $ 12.47 |  |
Baseline Common Share Value (in dollars per share) |  | $ 21.03 |  |
Expected Volatility of Common Shares |  | 21.00% |  |
Risk-free Interest Rate |  | 2.51% |  |
Performance-based PIUs | 2020 PB PIU |  |  |  |
Assumptions used to value stock awards |  |  |  |
Grant date fair value (in dollars per share) | $ 16.36 |  |  |
Baseline Common Share Value (in dollars per share) | $ 29.38 |  |  |
Expected Volatility of Common Shares | 18.00% |  |  |
Risk-free Interest Rate | 1.65% |  |  |
Performance share units |  |  |  |
Potential earned payout for defined levels of performance under awards |  |  |  |
Earned payout (as a percent of PSUs/ PIUs granted) on 75th or greater percentile rank |  |  |  | 200.00%
Earned payout (as a percent of PSUs/ PIUs granted) on 50th percentile rank (target) |  |  |  | 100.00%
Earned payout (as a percent of PSUs/ PIUs granted) on 25th percentile rank |  |  |  | 50.00%
Performance share units/ PB PIUs granted on percentile rank below 25th (as a percent) |  |  |  | 0.00%
Performance share units | 2018 PSU Grants |  |  |  |
Assumptions used to value stock awards |  |  |  |
Grant date fair value (in dollars per share) |  |  | $ 31.97 |
Baseline Common Share Value (in dollars per share) |  |  | $ 29.20 |
Expected Volatility of Common Shares |  |  | 17.00% |
Risk-free Interest Rate |  |  | 2.04% |

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- Definition Represents the baseline common share value that is used in valuing the grant date fair value of awards. + References No definition available. + Details
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- Definition Represents the earned payout, as a percentage of units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 25th percentile. + References No definition available. + Details
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- Definition Represents the earned payout, as a percentage of units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 50th percentile. + References No definition available. + Details
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- Definition Represents the earned payout, as a percentage of units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 75th percentile or greater. + References No definition available. + Details
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- Definition Represents the earned payout percentage based on percentile rank below 25. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -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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