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Segment Information (Purchase Accounting and Related Adjustments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Corporate and reconciling items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Purchase accounting and related adjustments $ 195.5 $ 194.0 $ 192.4
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 0.7 0.4 1.0
General and administrative expense      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Purchase accounting and related adjustments 54.7 58.7  
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 54.7 58.7 47.2
Amortization of recoupable portion of the purchase price 7.7 7.7 7.7
Noncontrolling interest discount amortization 13.2 22.7 22.7
Noncontrolling equity interest in distributable earnings 33.8 28.3 16.8
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 $ 140.1 $ 134.9 $ 144.2