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Recently Issued Accounting Standards (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Jan. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Net revenue |  | $ 660.9 | $ 515.3 | $ 1,832.5 | $ 1,502.8 |
Capitalized contract cost |  | 75.8 |  | 75.8 |  |
Accumulated deficit adjustment |  | (2,189.9) |  | (2,189.9) |  | $ (2,084.9)
Accounting Standards Update 2014-09 | Impact from the adoption of ASC 606 and 340-40 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Net revenue | $ 89.0 |  |  |  |  |
Capitalized contract cost | 90.4 |  |  |  |  |
Accumulated deficit adjustment | $ 179.4 | $ (138.7) |  | $ (138.7) |  |
Accumulated deficit | Accounting Standards Update 2016-16 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative increase to accumulated deficit |  |  |  |  |  | $ 1.9

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