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Segment Information (Reconciliation of Segment General and Administration to Consolidated) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses	$ 265.2	$ 258.1	$ 221.3
General and administration	490.5	531.1	475.4
Operating segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses	265.2	258.1	221.3
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate general and administrative expenses	136.1	122.9	97.1
Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	153.7	195.5	194.0
General and administrative expense
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	11.6	54.7
General and administrative expense | Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Share-based compensation expense included in general and administrative expense	77.6	95.4	98.3
Purchase accounting and related adjustments	$ 11.6	$ 54.7	$ 58.7

X

- Definition

General and administrative expenses for corporate and shared services not otherwise specifically identified in the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Other share-based compensation expense included in general and administrative expense.

+ References

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+ Details

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X

- Definition

The amortization of non-cash fair value adjustments to the assets and liabilities acquired in the acquisition of businesses.

+ References

No definition available.

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- Definition

Segment general and administration.

+ References

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X

- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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