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Segment Information (Purchase Accounting and Related Adjustments and Shareholder Litigation Settlements) (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 09, 2018	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Dec. 08, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Shareholder litigation settlements		$ 0.0	$ 0.0	$ 114.1
Corporate and reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		192.4	216.6	184.1
Direct operating | Corporate and reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		1.0	8.1	18.0
General and administrative expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		47.2	52.6
General and administrative expense | Corporate and reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		47.2	52.6	43.8
Depreciation and amortization expense | Corporate and reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments		$ 144.2	$ 155.9	122.3
Fiduciary Litigation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Shareholder litigation settlements				54.8
Settlement payment amount	$ 92.5			92.5
Insurance reimbursement, amount	$ 37.8			37.8
Appraisal Litigation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Shareholder litigation settlements				59.3
Settlement payment amount				$ 964.0
Value of original merger consideration, dissenting shareholders liability accrued at time of acquisition					$ 797.3

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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