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Net (Loss) Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net (loss) income $ (0.5) $ 1,906.9 $ 2,237.7
Dividends on Series A Preferred Stock (2.2) 0.0 0.0
Net (loss) income attributable to common stockholders $ (2.7) $ 1,906.9 $ 2,237.7
Basic weighted average common shares outstanding (in shares) 537.3 542.0 550.4
Dilutive effect of stock options and RSUs (in shares) 0.0 5.1 5.2
Dilutive effect of Series A Preferred Stock (in shares) 0.0 0.0 0.0
Diluted weighted average common shares outstanding (in shares) 537.3 548.0 557.3
Basic net (loss) income per common share (in dollars per share) $ (0.01) $ 3.52 $ 4.07
Diluted net (loss) income per common share (in dollars per share) $ (0.01) $ 3.48 $ 4.02
Common shares from equity incentive plans      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Anti-dilutive securities excluded from the calculation of diluted net loss per common share (in shares) 4.0    
Depository shares      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Anti-dilutive securities excluded from the calculation of diluted net loss per common share (in shares) 0.6    
2015 Senior Convertible Debt      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Dilutive effect of Convertible Debt (in shares) 0.0 0.2 0.6
Anti-dilutive securities excluded from the calculation of diluted net loss per common share (in shares) 0.1    
2015 Senior Convertible Debt | Weighted Average      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Debt instrument, convertible, conversion price (in dollars per share) $ 28.49 $ 29.02 $ 29.58
2017 Senior Convertible Debt      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Dilutive effect of Convertible Debt (in shares) 0.0 0.7 1.0
Anti-dilutive securities excluded from the calculation of diluted net loss per common share (in shares) 0.5    
2017 Senior Convertible Debt | Weighted Average      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Debt instrument, convertible, conversion price (in dollars per share) $ 44.27 $ 45.26 $ 46.14
2017 Junior Convertible Debt      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Dilutive effect of Convertible Debt (in shares) 0.0 0.0 0.1
2017 Junior Convertible Debt | Weighted Average      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Debt instrument, convertible, conversion price (in dollars per share) $ 0 $ 44.81 $ 45.32
2020 Senior Convertible Debt | Weighted Average      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Debt instrument, convertible, conversion price (in dollars per share) 91.08 91.91 92.82
2024 Senior Convertible Debt | Weighted Average      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Debt instrument, convertible, conversion price (in dollars per share) $ 121.83 $ 0 $ 0