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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
Ending balance 2,490.0 2,490.0
Hart Systems LLC    
Goodwill    
Opening balance sheet adjustments   (2.0)
Ending balance 59.0  
Enterprise Business    
Goodwill    
Opening balance sheet adjustments 8.0  
Foreign exchange impact (8.0)  
Acquisition – Enterprise   $ 2,336.0
Ending balance $ 2,300.0