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Total Consideration Transferred to Sellers (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 26, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]      
Cash paid   $ 4.6 $ 210.5
ICRA [Member]      
Business Acquisition [Line Items]      
Cash paid $ 86.0    
Business Combination Fair Value Of Equity Interest 124.9    
Total fair value of consideration transferred $ 210.9