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Debt - Maturities (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Jan. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 0.0  
2022 0.0  
2023 50.0  
2024 0.0  
2025 250.0  
Thereafter 591.9  
Long-term Debt $ 891.9 $ 891.8