v3.26.1
Property, Plant, and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and impairment $ (55.5) $ (56.9)
Property, plant, and equipment, net 189.9 150.8
Office equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 22.5 21.4
Property, plant and equipment, useful life 5 years  
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 64.4 59.9
Leasehold improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life 10 years  
Leasehold improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life 1 year  
Right-of-use assets [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 158.5 $ 126.4
Right-of-use assets [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life 10 years  
Right-of-use assets [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life 1 year