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Goodwill and Intangible Assets - Goodwill (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Columbus Container Inc    
Goodwill [Line Items]    
Adjustment to increase (decrease) goodwill   $ (5.7)
TimBar Corporation    
Goodwill [Line Items]    
Adjustment to increase (decrease) goodwill $ (1.1) $ (1.1)