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Acquisitions and Strategic Investments (2015 Copac Global Packaging, Inc. Acquisition) (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 14, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired   $ 0.9 $ 79.9  
Goodwill   $ 0.0   $ 0.0
Copac [Member]        
Business Acquisition [Line Items]        
Payments to acquire businesses, gross $ 59.4      
Cash acquired from acquisition 0.9      
Payments to acquire businesses, net of cash acquired 58.5      
Identifiable intangible assets $ 22.2      
Weighted average useful life of identifiable intangible assets 6 years      
Goodwill $ 23.5