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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

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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://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 + Details
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