Inventories (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories
Raw materials and supplies	$ 397.0	$ 426.7
Work in process and finished goods	796.2	664.5
Less inventory reserves	(49.6)	(46.8)
Inventories, net	$ 1,143.6	$ 1,044.4