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Shareholders' Equity - Plan Summary and Description (Details) - shares shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 | 0.0 | 0.0 | 0.1
RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1.7 | 1.8 | 1.2 | 1.3
SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1.3 | 2.3 | 2.2 | 1.5
2021 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Exercisable period | 7 years |  |  |
Common stock authorized for issuance (in shares) | 2.9 |  |  |
Remaining Shares of Common Stock Available for Future Issuance (in shares) | 4.0 |  |  |
2021 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2021 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.1 |  |  |
2021 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2020 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Remaining Shares of Common Stock Available for Future Issuance (in shares) | 0.0 |  |  |
2020 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2020 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.7 |  |  |
2020 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2016 and 2006 Plans |  |  |  |
Information pertaining to stock based awards |  |  |  |
Common stock subject to outstanding awards (in shares) | 3.0 |  |  |
2016 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Remaining Shares of Common Stock Available for Future Issuance (in shares) | 0.0 |  |  |
2016 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2016 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1.0 |  |  |
2016 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1.3 |  |  |
2006 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Remaining Shares of Common Stock Available for Future Issuance (in shares) | 0.0 |  |  |
2006 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |
2006 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.1 |  |  |
2006 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0.0 |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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