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Shareholders' Equity - RSU Awards and SSAR Awards (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SSAR Awards Exercisable |  |  |  |
Aggregate intrinsic value of SSAR Awards exercised | $ 0.8 |  | $ 0.9 |
RSUs |  |  |  |
Awards Outstanding |  |  |  |
Balance at the beginning of the period (in shares) | 3.0 | 1.7 | 1.8 |
Granted (in shares) | 1.3 | 2.1 | 0.7 |
Vested (in shares) | (0.8) | (0.6) | (0.5) |
Forfeited (in shares) | (0.5) | (0.3) | (0.3) |
Balance at the end of the period (in shares) | 3.0 | 3.0 | 1.7 | 1.8
Weighted Average Grant Date Fair Value Price |  |  |  |
Balance at the beginning of the period (in dollars per share) | $ 26.41 | $ 27.30 | $ 25.17 |
Granted (in dollars per share) | 23.48 | 25.86 | 33.08 |
Vested (in dollars per share) | 25.16 | 27.27 | 27.34 |
Forfeited (in dollars per share) | 23.24 | 25.97 | 28.55 |
Balance at the end of the period (in dollars per share) | $ 25.99 | $ 26.41 | $ 27.30 | $ 25.17
Aggregate Intrinsic Value | $ 67.9 | $ 81.4 | $ 46.3 | $ 57.1
Weighted Average Remaining Contractual Life (in Years) | 1 year 6 months | 1 year 7 months 6 days | 1 year 2 months 12 days | 1 year 3 months 18 days
Aggregate intrinsic value of awards issued | $ 18.2 | $ 14.8 | $ 18.1 |
Vesting period of outstanding equity awards | 3 years |  |  |
Weighted average fair value (in dollars per share) | $ 33.45 |  |  |
Expected term | 3 years |  |  |
Volatility | 52.20% |  |  |
Risk-free interest rates | 4.10% |  |  |
SSAR Awards |  |  |  |
Granted (in shares) | 0.5 |  |  |
SSAR Awards |  |  |  |
Weighted Average Grant Date Fair Value Price |  |  |  |
Aggregate Intrinsic Value | $ 0.0 | $ 0.8 | $ 0.6 | $ 7.3
Weighted Average Remaining Contractual Life (in Years) | 9 months 18 days | 10 months 24 days | 1 year 10 months 24 days | 2 years 6 months
SSAR Awards |  |  |  |
Balance at the beginning of the period (in shares) | 0.5 | 1.3 | 2.3 |
Exercised (in shares) | (0.2) |  | (0.1) |
Expired (in shares) |  | (0.1) |  |
Forfeited (in shares) |  | (0.6) | (1.0) |
Balance at the end of the period (in shares) | 0.3 | 0.5 | 1.3 | 2.3
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) | $ 26.35 | $ 28.78 | $ 29.08 |
Exercised (in dollars per share) | 26.40 |  | 24.89 |
Expired (in dollars per share) |  | 36.25 |  |
Forfeited (in dollars per share) |  | 29.58 | 29.91 |
Balance at the end of the period (in dollars per share) | $ 26.09 | $ 26.35 | $ 28.78 | $ 29.08
SSAR Awards Exercisable |  |  |  |
SSAR Awards (in shares) | 0.3 | 0.4 | 0.4 | 0.2
Weighted Average Exercise Price (in dollars per share) | $ 26.09 | $ 27.43 | $ 29.18 | $ 41.85
Aggregate Intrinsic Value | $ 0.0 | $ 0.3 | $ 0.2 | $ 0.0
Weighted Average Remaining Contractual Life (in Years) | 9 months 18 days | 6 months | 1 year | 9 months 18 days

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(03) -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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(02) -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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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The aggregate intrinsic value of outstanding awards of equity-based plans excluding option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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