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Special Charges and Other, Net - Roll Forward of Accrued Restructuring and Other Exit Cost Charges (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2025
USD ($)
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance $ 0.0
Restructuring Charges $ 76.5
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonrecurring (Income) Expense
Payments for Restructuring $ (13.2)
Non-cash - Other (41.2)
Restructuring reserve, ending balance 22.1
Restructuring reserve, current 19.0
Restructuring reserve, noncurrent 3.1
Employee Separation Costs  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 0.0
Restructuring Charges 27.1
Payments for Restructuring (9.9)
Non-cash - Other (0.1)
Restructuring reserve, ending balance 17.1
Contract Exit Costs  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 0.0
Restructuring Charges 45.7
Payments for Restructuring 0.0
Non-cash - Other (41.1)
Restructuring reserve, ending balance 4.6
Other  
Restructuring Reserve [Roll Forward]  
Restructuring reserve, beginning balance 0.0
Restructuring Charges 3.7
Payments for Restructuring (3.3)
Non-cash - Other 0.0
Restructuring reserve, ending balance $ 0.4