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Summary of Significant Accounting Policies - Schedule of inventory, current (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Finished goods $ 127.6 $ 130.1
Work-in-process 11.3 10.7
Raw materials and supplies 49.9 56.0
Total $ 188.8 $ 196.8