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Correction to previously issued financial statements - Adjustments to Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Cash Flows            
Net income (loss) $ 35.8 $ 25.9 $ 58.8 $ 37.6    
Deferred income taxes     (0.6) (9.5)    
Accounts receivable, net     (22.9) (16.2)    
Inventories, net     (2.4) (9.1)    
Accrued expenses     0.2 (2.4)    
Income taxes payable       6.7    
Changes in other operating assets and liabilities, net     1.7 (1.0)    
Net cash provided by (used in) operating activities     52.7 36.2    
Transactions with WestRock, net     0.0 51.9    
Net cash provided by (used in) financing activities     $ (15.1) 78.8    
As reported            
Statement of Cash Flows            
Net income (loss)   25.8   35.6    
Deferred income taxes       (10.6)    
Accounts receivable, net       (18.3)    
Inventories, net       (4.0)    
Accrued expenses       (1.9)    
Income taxes payable       6.5    
Changes in other operating assets and liabilities, net       (0.7)    
Net cash provided by (used in) operating activities       36.7    
Transactions with WestRock, net       51.4    
Net cash provided by (used in) financing activities       78.3    
Increase/(decrease)            
Statement of Cash Flows            
Net income (loss)   $ 0.1   2.0 $ (1.0) $ (0.6)
Deferred income taxes       1.1    
Accounts receivable, net       2.1    
Inventories, net       (5.1)    
Accrued expenses       (0.5)    
Income taxes payable       0.2    
Changes in other operating assets and liabilities, net       (0.3)    
Net cash provided by (used in) operating activities       (0.5)   $ (6.0)
Transactions with WestRock, net       0.5    
Net cash provided by (used in) financing activities       $ 0.5