Share-Based Compensation, CVARs, Employee Stock Purchase Plan and Subsidiary Equity Incentive Plans (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Subsidiary Equity Incentive Plans [Member]
Subsidiary Equity Incentive Plans [Abstract]
Share-based compensation expense	$ 14.9	$ 11.5
CVARs [Member] \| March 2020 CVAR Grants [Member]
Share-Based Compensation [Abstract]
Number of non-service-vested shares (in shares)	1,176,198
Number of service-vested shares (in shares)	29,084,574
Number of shares settled (in shares)	1,711,450
Number of shares issued (in shares)	534,942
CVARs [Member] \| November 2021 CVAR Grants [Member]
Share-Based Compensation [Abstract]
Number of shares issued (in shares)	325,655
CVARs [Member] \| RSL 2021 EIP [Member] \| November 2021 CVAR Grants [Member]
Capped Value Appreciation Rights [Abstract]
Non-vested balance, beginning (in shares)	3,222,645
Vested (in shares)	(325,655)
Forfeited (in shares)	(32,413)
Non-vested balance, ending (in shares)	2,864,577

The number of equity instruments vested and settled during the period.

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The number of non-service-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

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Number of fully service vested options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

No definition available.

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- References

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- 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
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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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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-Section 50
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-Topic 718
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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- Definition

Number of shares issued under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 50
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