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Income Tax (Error Corrections) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Apr. 30, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Jul. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Jan. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes | $ (13.5) | $ 14.4 | $ (21.3) | $ (269.5) | $ (272.2) | $ (53.1) | $ (293.5) |
Net loss | (142.8) | $ (167.7) | $ (43.8) | $ (268.6) | $ (249.5) | (408.7) | $ (293.3) |
Basic and diluted net loss per share (in dollars per share) |  | $ (0.75) |  | $ (1.18) | $ (1.10) |  |  |
Current deferred tax liabilities |  |  |  | $ 9.5 | $ 9.5 |  |  |
Accrued income taxes | 85.9 |  |  | 22.9 | 22.9 | 85.9 |  | $ 29.4
Long-term deferred tax liabilities | 75.9 |  |  | 54.0 | 54.0 | 75.9 |  | 67.7
Long-term income tax payable | 40.0 | $ 37.3 |  | 160.2 | 160.2 | 40.0 |  | 161.4
Accumulated deficit | $ (634.7) | (193.3) |  | 131.3 | 131.3 | $ (634.7) |  | $ (80.8)
Scenario, Previously Reported |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes |  | 14.4 |  | (236.4) | (239.1) |  |  |
Net loss |  | $ (173.0) |  | $ (235.5) | $ (216.4) |  |  |
Basic and diluted net loss per share (in dollars per share) |  | $ (0.77) |  | $ (1.04) | $ (0.95) |  |  |
Current deferred tax liabilities |  |  |  | $ 8.3 | $ 8.3 |  |  |
Accrued income taxes |  |  |  | 52.3 | 52.3 |  |  |
Long-term deferred tax liabilities |  |  |  | 28.9 | 28.9 |  |  |
Long-term income tax payable |  | $ 153.8 |  | 124.0 | 124.0 |  |  |
Accumulated deficit |  | $ (308.2) |  | 164.4 | 164.4 |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | (33.1) | (33.1) |  |  |
Net loss |  |  |  | $ (33.1) | $ (33.1) |  |  |
Basic and diluted net loss per share (in dollars per share) |  |  |  | $ (0.14) | $ (0.15) |  |  |
Current deferred tax liabilities |  |  |  | $ 1.2 | $ 1.2 |  |  |
Accrued income taxes |  |  |  | (29.4) | (29.4) |  |  |
Long-term deferred tax liabilities |  |  |  | 25.1 | 25.1 |  |  |
Long-term income tax payable |  |  |  | 36.2 | 36.2 |  |  |
Accumulated deficit |  |  |  | $ (33.1) | $ (33.1) |  |  |

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