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Segment Information (Purchase Accounting and Related Adjustments and Shareholder Litigation Settlements) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 09, 2018 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 08, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Shareholder litigation settlements |  |  | $ 0.0 | $ 114.1 | $ 0.0 |
Corporate and reconciling items |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Purchase accounting and related adjustments |  |  | 216.6 | 184.1 | 170.3 |
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 |  |  | 8.1 | 18.0 | 44.5 |
General and administrative expense |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Purchase accounting and related adjustments |  |  | 52.6 | 43.8 |  |
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 |  |  | 52.6 | 43.8 | 6.1 |
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 |  |  | $ 155.9 | 122.3 | $ 119.7 |
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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