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Summary of Significant Accounting Policies - Components of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 271.9 $ 260.6
Work in process 12.9 14.2
Finished goods 206.5 189.7
Supplies and materials 232.3 212.3
Inventories $ 723.6 $ 676.8