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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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.

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Shareholders' Equity - Plan Summary and Description (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SSAR Awards
Information pertaining to stock based awards
Outstanding awards issued (in shares)	0.3	0.5	1.3	2.3
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)	1.9
2021 Plan \| RSUs
Information pertaining to stock based awards
Outstanding awards issued (in shares)	2.6
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 \| RSUs
Information pertaining to stock based awards
Outstanding awards issued (in shares)	0.3
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)	3.2
2016 Plan
Information pertaining to stock based awards
Remaining Shares of Common Stock Available for Future Issuance (in shares)	0.0
2016 Plan \| RSUs
Information pertaining to stock based awards
Outstanding awards issued (in shares)	0.0
2016 Plan \| SSAR Awards
Information pertaining to stock based awards
Outstanding awards issued (in shares)	0.3
2006 Plan
Information pertaining to stock based awards
Remaining Shares of Common Stock Available for Future Issuance (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