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Mergers and Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 15, 2018 | Aug. 09, 2017 | Jul. 01, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 344.2 |  |  | $ 151.6
AW business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net tangible assets acquired |  | $ 65.9 |  |
Goodwill |  | 171.9 |  |
Total purchase price |  | 469.8 |  |
AW business | Developed technology |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  | 113.5 |  |
AW business | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  | 75.0 |  |
AW business | Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  | 28.0 |  |
AW business | Backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  | 6.5 |  |
Trilithic, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net tangible assets acquired |  |  | $ 11.8 |
Goodwill |  |  | 17.8 |
Total purchase price |  |  | 56.4 |
Trilithic, Inc | Developed technology |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  |  | 15.5 |
Trilithic, Inc | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  |  | 11.0 |
Trilithic, Inc | Other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  |  | $ 0.3 |
In-process research and development | AW business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets acquired: |  | $ 9.0 |  |

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