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Stock-Based Compensation (Number Of Shares And Related Grant Date Fair Value Of PSU) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grant date per share fair value (in dollars per share) |  |  |  | $ 14.66 |  |
Performance Stock Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total shares base award (in shares) |  |  |  | 0.1 |  |
Grant date per share fair value (in dollars per share) |  |  |  | $ 29.31 |  |
Risk-free interest rate |  |  |  | 4.40% |  |
Vesting period in years |  |  |  | 3 years |  |
Expected volatility |  |  |  | 45.70% |  |
Expected dividend yield |  |  |  | 5.50% |  |
Award Year 2019, PSU - EBIT CAGR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout as a Percent of the Base Award |  |  | 127.00% |  |  |
Number of shares distributed (in shares) |  |  | 0.1 |  |  |
Cash Portion |  |  | $ 3.5 |  |  |
Award Year 2020, PSU - EBIT CAGR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout as a Percent of the Base Award |  | 0.00% |  |  |  |
Number of shares distributed (in shares) |  | 0.0 |  |  |  |
Cash Portion |  | $ 0.0 |  |  |  |
Award Year 2021, PSU - EBIT CAGR | Forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout as a Percent of the Base Award | 6.00% |  |  |  |  |
Number of shares distributed (in shares) | 0.1 |  |  |  |  |
Cash Portion | $ 0.1 |  |  |  |  |
2023 awards and prior year TSR Based awards | Performance Stock Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total shares base award (in shares) |  |  |  |  | 0.1 | 0.1
Grant date per share fair value (in dollars per share) |  |  |  |  | $ 41.13 | $ 49.43
Risk-free interest rate |  |  |  |  | 1.70% | 0.20%
Vesting period in years |  |  |  |  | 3 years | 3 years
Expected volatility |  |  |  |  | 45.20% | 44.30%
Expected dividend yield |  |  |  |  | 4.60% | 3.70%
Prior year EBIT CAGR Based awards | Performance Stock Unit |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total shares base award (in shares) |  |  |  | 0.0 | 0.1 | 0.1
Grant date per share fair value (in dollars per share) |  |  |  | $ 0 | $ 32.88 | $ 38.77
Vesting period in years |  |  |  | 0 years | 3 years | 3 years

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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