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Transactions with WestRock and related-parties - Summary of Condensed Consolidated Statements of Operations (Details) - Affiliated Entity - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating Income (Loss)        
Total allocated cost $ 0.0 $ 7.0 $ 0.0 $ 19.4
Cost of sales        
Operating Income (Loss)        
Total allocated cost 0.0 1.4 0.0 5.7
Selling, general and administrative expenses        
Operating Income (Loss)        
Total allocated cost 0.0 2.2 0.0 6.5
Interest expense, net        
Operating Income (Loss)        
Total allocated cost $ 0.0 $ 3.4 $ 0.0 $ 7.2