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Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Changes in the components of AOCI
Beginning balance	$ 5,894.8	$ 5,337.1	$ 5,585.5
Other comprehensive income (loss), net of tax effect	16.5	5.6	(4.6)
Ending balance	6,513.6	5,894.8	5,337.1
Total
Changes in the components of AOCI
Beginning balance	(20.6)	(26.2)	(21.6)
Other comprehensive income (loss), net of tax effect	16.5	5.6	(4.6)
Ending balance	(4.1)	(20.6)	(26.2)
Minimum Pension Liability
Changes in the components of AOCI
Beginning balance	(5.6)	(13.4)
Other comprehensive income (loss), net of tax effect	16.6	7.8
Ending balance	11.0	(5.6)	(13.4)
Foreign Currency
Changes in the components of AOCI
Beginning balance	(15.0)	(12.8)
Other comprehensive income (loss), net of tax effect	(0.1)	(2.2)
Ending balance	$ (15.1)	$ (15.0)	$ (12.8)

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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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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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