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Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 2,706.5 | $ 2,445.0
Spacemaker |  |
Business Acquisition [Line Items] |  |
Goodwill | 189.4 |
Deferred revenue (current and non-current) | (0.4) |
Net tangible assets (liabilities) | 7.3 |
Total | 231.1 |
Spacemaker | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 29.8 |
Spacemaker | Customer relationships |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 3.9 |
Spacemaker | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 1.1 |
Series of Individually Immaterial Business Acquisitions |  |
Business Acquisition [Line Items] |  |
Goodwill | 31.4 |
Deferred revenue (current and non-current) | (2.2) |
Net tangible assets (liabilities) | (2.3) |
Total | 45.4 |
Series of Individually Immaterial Business Acquisitions | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 12.0 |
Series of Individually Immaterial Business Acquisitions | Customer relationships |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 5.7 |
Series of Individually Immaterial Business Acquisitions | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 0.8 |
Fiscal 2019 acquisitions |  |
Business Acquisition [Line Items] |  |
Goodwill | 220.8 |
Deferred revenue (current and non-current) | (2.6) |
Net tangible assets (liabilities) | 5.0 |
Total | 276.5 |
Fiscal 2019 acquisitions | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 41.8 |
Fiscal 2019 acquisitions | Customer relationships |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 9.6 |
Fiscal 2019 acquisitions | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | $ 1.9 |

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