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Business Acquisition - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jul. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 786.7   $ 764.7
CoolSystems, Inc. referred to as Game Ready      
Business Acquisition [Line Items]      
Current assets acquired net of liabilities assumed   $ 8.8  
Property, plant and equipment   1.0  
Identifiable intangible assets   40.0  
Other noncurrent assets (liabilities), net   (0.2)  
Deferred tax liabilities   (4.3)  
Goodwill   22.7  
Total   $ 68.0