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Debt - Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Fiscal year ending March 31,    
2021 $ 0.0  
2022 1,000.0  
2023 0.0  
2024 3,454.6  
2025 726.7  
Thereafter 5,018.1  
Total $ 10,199.4 $ 10,593.3