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Recently Issued Accounting Standards (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Jan. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Net revenue |  | $ 611.7 | $ 501.8 | $ 1,171.6 | $ 987.5 |
Capitalized contract cost |  | 82.5 |  | 82.5 |  |
Accumulated deficit |  | (2,103.2) |  | (2,103.2) |  | $ (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 | $ 179.4 | $ (144.7) |  | $ (144.7) |  |
Retained Earnings | 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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