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Segment Information (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Concentration Risk [Line Items] |  |  |
Revenues | $ 4,016.9 | $ 3,854.8 | $ 3,604.3
Customer Concentration Risk | Sales Revenue, Net | One Customer |  |  |
Concentration Risk [Line Items] |  |  |
Revenues | $ 831.0 | $ 766.6 | $ 639.2
Percentage of consolidated gross accounts receivable attributable to customer over threshold | 10.00% | 10.00% | 10.00%
Customer Concentration Risk | Accounts Receivable | One Customer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of consolidated gross accounts receivable attributable to customer over threshold | 11.60% |  |
Accounts Receivable, after Allowance for Credit Loss | $ 100.9 |  |

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