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Acquisitions (Narrative) (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]              
Business Combination, Integration Related Costs   $ 0.0 $ 1.8 $ 0.0 $ 3.4    
Restructuring Charges   $ 0.0 $ 6.8 (0.4) 7.3    
Restructuring Costs       $ 0.0 1.4    
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%   2.75%  
Acquisition Related Restructuring [Member]              
Business Acquisition [Line Items]              
Restructuring Charges       $ (0.4)   $ (0.6) $ 10.3
Restructuring Costs         $ 0.2