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Segment Information (Reconciliation of Segment General and Administration to Consolidated) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses	$ 242.8	$ 229.6	$ 246.8
General and administration	486.6	430.4	445.4
Operating segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment general and administrative expenses	242.8	229.6	246.8
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate general and administrative expenses	113.7	99.7	104.2
Corporate and reconciling items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	192.4	216.6	184.1
General and administrative expense
Segment Reporting, Other Significant Reconciling Item [Line Items]
Purchase accounting and related adjustments	47.2	52.6
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	82.9	48.5	50.6
Purchase accounting and related adjustments	$ 47.2	$ 52.6	$ 43.8

X

- Definition

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

+ References

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- Definition

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

+ References

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- Definition

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

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- Definition

Segment general and administration.

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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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.

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