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Debt - Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Fiscal year ending March 31,    
2022 $ 0.0  
2023 0.0  
2024 5,358.6  
2025 1,806.9  
2026 1,200.0  
Thereafter 455.9  
Gross long-term debt including current maturities $ 8,821.4 $ 9,209.4