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Stock-Based Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Long-Term Incentive Plan
Stock-based compensation expense	$ 9.7	$ 9.6	$ 27.2	$ 32.6
Options granted (shares)			1.0
Options granted exercise price (in dollars per share)			$ 13.27
Performance-based restricted stock units and Restricted stock units granted (in shares)			4.4
Performance-based restricted stock units and Restricted stock units weighted average grant date fair value (in dollars per share)			$ 13.05
Number of options outstanding (in shares)	7.1		7.1
Exercise price of options outstanding (in dollars per share)	$ 18.09		$ 18.09
Number of options exercisable (in shares)	4.2		4.2
Exercise price of options exercisable (in dollars per share)	$ 19.28		$ 19.28
Number of non-vested Performance-based restricted stock units and Restricted stock units (in shares)	7.7		7.7
Grant date fair value of Performance-based restricted stock units and Restricted stock units (in dollars per share)	$ 16.53		$ 16.53

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
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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
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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
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-Name Accounting Standards Codification
-Section 50
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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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