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Commitments and Contingencies - Minimum Rental Payments under Non-Cancelable Operating Leases (Details)
$ in Millions
Jan. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 292.8
2021 239.2
2022 212.8
2023 177.4
2024 146.8
Thereafter $ 438.0