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Goodwill and Other Intangibles - Changes in Net Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill    
Beginning balance $ 2,490.0 $ 156.0
Opening balance sheet adjustments 3.0  
Ending balance 2,493.0 2,490.0
Hart Systems LLC    
Goodwill    
Opening balance sheet adjustments   (2.0)
Ending balance 59.0  
Enterprise Business    
Goodwill    
Opening balance sheet adjustments 11.0  
Foreign exchange impact (8.0)  
Acquisition – Enterprise   $ 2,336.0
Ending balance $ 2,300.0