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Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Apr. 01, 2016
Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill $ 3,001.6   $ 2,981.3
BTI Systems, Inc [Member]      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Net tangible liabilities assumed   $ (19.5)  
Intangible assets acquired   43.3  
Goodwill   20.3  
Total   $ 44.1