Inventories (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of inventories
Finished goods	$ 251.4	$ 258.0
Work in process	11.8	12.0
Raw materials and repair parts	188.9	180.1
Gross inventories	452.1	450.1
Excess of current cost over last-in, first-out cost	(73.3)	(75.3)
Total inventories, net	378.8	374.8
Inventories (Textual) [Abstract]
Pre-tax income (loss) from LIFO inventory liquidations	$ 0.3	$ (0.1)	$ 0.1