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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
12 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]  
Property and Equipment Depreciation is provided for on a straight line basis over the following useful lives:
Distribution equipment
3 — 7 years
Computer equipment and software 
3 years
Furniture, fixtures and office equipment 
5 — 7 years
Leasehold improvements Remaining lease term or the useful life, whichever is shorter
March 31, 2025March 31, 2024
 (Amounts in millions)
Distribution equipment$19.3 $19.3 
Leasehold improvements31.7 31.1 
Furniture, fixtures and office equipment4.4 4.4 
Computer equipment25.9 25.6 
Capitalized software130.9 114.1 
 212.2 194.5 
Less accumulated depreciation and amortization(163.6)(143.4)
 $48.6 $51.1