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Acquisitions (Narrative) (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Business Combination, Integration Related Costs   $ 0.0 $ 1.6    
Restructuring Charges   $ (0.4) $ 0.5    
MEI Conlux Holdings [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred $ 804.0        
2.75% Notes Due 2018          
Business Acquisition [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   2.75%   2.75%  
Acquisition Related Restructuring [Member]          
Business Acquisition [Line Items]          
Restructuring Charges   $ (0.4)   $ (0.6) $ 10.3