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Acquisition - Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions | Feb. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 2,524.7 | $ 2,462.8
Scalar |  |  |
Business Acquisition [Line Items] |  |  |
Net assets acquired | $ 5.9 |  |
Identified intangible assets | 20.3 |  |
Goodwill | 61.8 |  |
Total purchase price | 88.0 |  |
Intangible assets, deferred tax liability | $ 7.0 |  |

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