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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ (0.8) | $ 1.6 | $ (4.7)
Deferred |  |  |  |  |  |  |  |  | (19.3) | 8.4 | 220.9
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (0.3) | (1.9) | 0.5
Deferred |  |  |  |  |  |  |  |  | 2.2 | 1.3 | 20.9
Foreign: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 50.9 | 93.9 | 68.4
Deferred |  |  |  |  |  |  |  |  | (23.1) | (45.0) | 4.2
Income tax expense | $ (24.8) | $ 8.6 | $ 17.6 | $ 8.2 | $ 5.2 | $ 13.5 | $ 25.2 | $ 14.4 | $ 9.6 | $ 58.3 | $ 310.2

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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