XML 18 R46.htm IDEA: XBRL DOCUMENT v3.2.0.727
Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 158.2 $ 176.2
Raw materials and precious metals 124.1 88.0
In-process inventories 18.5 20.6
Parts and supplies 48.7 44.8
Inventories $ 349.5 $ 329.6