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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