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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ (2.3) | $ (13.3) | $ (0.8)
Deferred |  |  |  |  |  |  |  |  | 7.6 | (6.7) | (19.3)
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (0.4) | (1.8) | (0.3)
Deferred |  |  |  |  |  |  |  |  | 2.1 | 0.1 | 2.2
Foreign: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 69.6 | 65.3 | 50.9
Deferred |  |  |  |  |  |  |  |  | 3.7 | (5.5) | (23.1)
Income tax expense | $ (8.5) | $ 29.7 | $ 26.3 | $ 32.8 | $ (31.7) | $ 35.2 | $ 16.0 | $ 18.6 | $ 80.3 | $ 38.1 | $ 9.6

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