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COMBINED STATEMENTS OF EQUITY - USD ($)
Total
Parent Net Investment
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 2,798,400,000 $ 2,779,200,000 $ 19,200,000
Net loss (1,871,000,000) (1,871,000,000) 0
Net transfers from Parent 604,400,000 604,400,000 0
Ending balance at Mar. 31, 2023 1,531,800,000 1,512,600,000 19,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 1,531,800,000 1,512,600,000 19,200,000
Net loss (915,200,000) (915,200,000) 0
Net transfers from Parent 302,600,000 302,600,000 0
Ending balance at Mar. 31, 2024 919,200,000 900,000,000.0 19,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 919,200,000 900,000,000.0 19,200,000
Net loss (211,200,000) (211,200,000) 0
Net transfers from Parent 58,400,000 58,400,000 0
Ending balance at Mar. 31, 2025 766,400,000 747,200,000 19,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 766,400,000 $ 747,200,000 $ 19,200,000