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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

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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